[In the beginning it was zoonosis: One Health to combat this and future pandemics. SESPAS Report 2022]. / En el principio fue la zoonosis: One Health para combatir esta y futuras pandemias. Informe SESPAS 2022.

The new pandemic, COVID-19, highlighted the importance of the animal-human-environment interface in the emergence of zoonoses. The jump of the species barrier is considered a rare event although the number of emerging infectious diseases increased significantly in the second half of the 20th century. Most of them transmitted from wildlife to humans. Several elements can contribute to the emergence of zoonoses: human interaction on ecosystems, biodiversity loss, changes in land use, climate change, trade in or consumption of wildlife. There are different stages in the adaptation of an animal pathogen into a specialized human pathogen, varying from its presence in animals without human infection to a pathogen exclusive to humans. The history of zoonoses allows the identification of critical points for their control, as well as the identification of probable virus or bacteria involved in future pandemics. Concerning COVID-19, the knowledge of the possible reservoirs of SARS-CoV-2 contributed to decision-making during the pandemic. Therefore, and given the variety of scenarios that allow the jump of species barrier or the evolution of pathogens in a new host, One Health strategies for zoonosis emergence surveillance should be implemented.

[Occupational exposure to influenza virus of the wild birds]. / Exposición ocupacional a los virus influenza de las aves silvestres.

Wild waterfowl are considered the main natural reservoir of influenza viruses and they have contributed to the reassortment of both pandemic viruses and viruses responsible for outbreaks of avian influenza in wild and domestic species. In order to determinate the factors involved, we reviewed the human cases of avian influenza related to the management of wild birds, the use of personal protective equipment, as well as the basis of surveillance programs of highly pathogenic avian influenza in wild birds in Spain. The direct transmission of influenza virus from wild birds to humans is a rare event. However, our epidemiological context is influenced by climate change and marked by the presence of migratory routes from territories where infection may be present. Thus and due to the clinical, economical and public health implications that such infections may have, the different groups exposed to wild birds (veterinarians, biologists, ornithologists, conservationists, field technicians, environmental officers, falconers, hunters, etc.) should know which are the possible sources of infection and how to handle the personal protective equipment. Besides, it is important that those groups know the current sanitary situation regarding avian influenza so they can consequently adapt their activities and employ proper protective measures, in addition to providing valuable information for surveillance programs.

Las aves acuáticas silvestres representan el principal reservorio natural de los virus influenza y han participado en el reordenamiento tanto de virus pandémicos como de los virus responsables de los brotes de gripe aviar en las especies domésticas y silvestres. Con el objetivo de conocer los determinantes implicados, en el presente trabajo se revisaron los casos humanos de influenza aviar asociados al manejo de avessilvestres y la utilización de los equipos de protección personal, así como las bases de la vigilancia de la influencia aviar altamente patógena en aves silvestres en España. Las evidencias existentes permiten concluir que la transmisión directa de virus influenza desde las aves silvestres al ser humano es un evento raro. No obstante, nuestro contexto epidemiológico se encuentra influido por el cambio climático y queda marcado por la presencia de rutas migratorias desde territorios donde la infección puede estar presente. Por ello, y ante las implicaciones clínicas, económicas y para la salud pública que dichas infecciones pueden tener, los diferentes colectivos expuestos a las aves silvestres (veterinarios, biólogos, ornitólogos, conservacionistas, técnicos de campo, agentes medioambientales, cetreros, cazadores, etc.) deberían conocer las posibles fuentes de contagio y manejar correctamente los equipos de protección personal. Al mismo tiempo, es importante que dichos grupos conozcan la situación sanitaria actualizada respecto a la influenza aviar, para adaptar sus actividades en consecuencia y poder aplicar las medidas de protección de forma proporcionada a la misma, amén de aportar una valiosa información para los programas de vigilancia.

Exposición ocupacional a los virus influenza de las aves silvestres / Occupational exposure to influenza virus of the wild birds

Las aves acuáticas silvestres representan el principal reservorio natural de los virus influenza y han participado en el reordenamiento tanto de virus pandémicos como de los virus responsables de los brotes de gripe aviar en las especies domésticas y silvestres. Con el objetivo de conocer los determinantes implicados, en el presente trabajo se revisaron los casos humanos de influenza aviar asociados al manejo de avessilvestres y la utilización de los equipos de protección personal, así como las bases de la vigilancia de la influencia aviar altamente patógena en aves silvestres en España. Las evidencias existentes permiten concluir que la transmisión directa de virus influenza desde las aves silvestres al ser humano es un evento raro. No obstante, nuestro contexto epidemiológico se encuentra influido por el cambio climático y queda marcado por la presencia de rutas migratorias desde territorios donde la infección puede estar presente. Por ello, y ante las implicaciones clínicas, económicas y para la salud pública que dichas infecciones pueden tener, los diferentes colectivos expuestos a las aves silvestres (veterinarios, biólogos, ornitólogos, conservacionistas, técnicos de campo, agentes medioambientales, cetreros, cazadores, etc.) deberían conocer las posibles fuentes de contagio y manejar correctamente los equipos de protección personal. Al mismo tiempo, es importante que dichos grupos conozcan la situación sanitaria actualizada respecto a la influenza aviar, para adaptar sus actividades en consecuencia y poder aplicar las medidas de protección de forma proporcionada a la misma, amén de aportar una valiosa información para los programas de vigilancia

Wild waterfowl are considered the main natural reservoir of influenza viruses and they have contributed to the reassortment of both pandemic viruses and viruses responsible for outbreaks of avian influenza in wild and domestic species. In order to determinate the factors involved, we reviewed the human cases of avian influenza related to the management of wild birds, the use of personal protective equipment, as well as the basis of surveillance programs of highly pathogenic avian influenza in wild birds in Spain. The direct transmission of influenza virus from wild birds to humans is a rare event. However, our epidemiological context is influenced by climate change and marked by the presence of migratory routes from territories where infection may be present. Thus and due to the clinical, economical and public health implications that such infections may have, the different groups exposed to wild birds (veterinarians, biologists, ornithologists, conservationists, field technicians, environmental officers, falconers, hunters, etc.) should know which are the possible sources of infection and how to handle the personal protective equipment. Besides, it is important that those groups know the current sanitary situation regarding avian influenza so they can consequently adapt their activities and employ proper protective measures, in addition to providing valuable information for surveillance programs

[Zoonoses and occupational health in the veterinary profession]. / Zoonosis y salud laboral en la profesión veterinaria.

The veterinary profession implies a greater risk of infection by zoonotic pathogens than the overall population. The aim of the present work was to evaluate the impact of zoonoses on the occupational health of veterinarians reviewing the published surveys addressing this subject. Following these inquiries, between 4% and 64.3% of the surveyed professionals acknowledge to have suffered at least one zoonotic disease, and dermatophytosis is the most frequently described zoonosis. In addition, from a qualitative point of view, it is necessary to highlight the occurrence of different diseases of important clinical seriousness and the existence of infections by antimicrobial-resistant pathogens. Due to the absence of updated studies in Spain, the present work reflects on the need to recognize the health determinants associated to the veterinary profession within the characteristics of our labour market. The available data suggest that the occurrence of zoonoses as occupational diseases is underestimated in Spain. Therefore, performing surveys on occupational health, documenting and publishing cases and reviewing the risks and the impact of zoonotic diseases on the veterinary profession would contribute to the description and notification of such diseases on behalf of the healthcare administration and would also become an essential tool in occupational risk prevention.

La profesión veterinaria presenta mayor riesgo de infección frente a agentes patógenos de carácter zoonósico que la población general. Con el objetivo de valorar el impacto de las zoonosis, el presente trabajo revisa las encuestas publicadas sobre salud laboral en la profesión veterinaria. En dichas encuestas, el rango de profesionales que refieren haber padecido al menos una zoonosis oscila entre el 4% y el 64,3%, siendo la dermatofitosis la zoonosis comunicada con mayor frecuencia. Además, desde el punto de vista cualitativo, cabe destacar la comunicación de diferentes procesos de especial gravedad clínica, así como la existencia documentada de infecciones por agentes patógenos resistentes a los antimicrobianos. Dada la ausencia de estudios actualizados en España, se reflexiona sobre la necesidad de conocer los determinantes de salud asociados a las características del mercado laboral de la profesión en nuestro entorno. Los datos existentes sugieren que la consideración legal de enfermedad profesional para las zoonosis se encuentra infraestimada en nuestro país. Por todo ello, la realización de encuestas de salud laboral, la documentación y publicación de los casos, así como la revisión de los riesgos y el impacto de las zoonosis en la profesión veterinaria, pueden contribuir a la calificación y notificación de dichas enfermedades por parte de la administración sanitaria, al tiempo que suponen una herramienta fundamental en el ámbito de la prevención de riesgos laborales.

Zoonosis y salud laboral en la profesión veterinaria / Zoonoses and occupational health in the veterinary profession

La profesión veterinaria presenta mayor riesgo de infección frente a agentes patógenos de carácter zoonósico que la población general. Con el objetivo de valorar el impacto de las zoonosis, el presente trabajo revisa las encuestas publicadas sobre salud laboral en la profesión veterinaria. En dichas encuestas, el rango de profesionales que refieren haber padecido al menos una zoonosis oscila entre el 4% y el 64,3%, siendo la dermatofitosis la zoonosis comunicada con mayor frecuencia. Además, desde el punto de vista cualitativo, cabe destacar la comunicación de diferentes procesos de especial gravedad clínica, así como la existencia documentada de infecciones por agentes patógenos resistentes a los antimicrobianos. Dada la ausencia de estudios actualizados en España, se reflexiona sobre la necesidad de conocer los determinantes de salud asociados a las características del mercado laboral de la profesión en nuestro entorno. Los datos existentes sugieren que la consideración legal de enfermedad profesional para las zoonosis se encuentra infraestimada en nuestro país. Por todo ello, la realización de encuestas de salud laboral, la documentación y publicación de los casos, así como la revisión de los riesgos y el impacto de las zoonosis en la profesión veterinaria, pueden contribuir a la calificación y notificación de dichas enfermedades por parte de la administración sanitaria, al tiempo que suponen una herramienta fundamental en el ámbito de la prevención de riesgos laborales

The veterinary profession implies a greater risk of infection by zoonotic pathogens than the overall population. The aim of the present work was to evaluate the impact of zoonoses on the occupational health of veterinarians reviewing the published surveys addressing this subject. Following these inquiries, between 4% and 64.3% of the surveyed professionals acknowledge to have suffered at least one zoonotic disease, and dermatophytosis is the most frequently described zoonosis. In addition, from a qualitative point of view, it is necessary to highlight the occurrence of different diseases of important clinical seriousness and the existence of infections by antimicrobial-resistant pathogens. Due to the absence of updated studies in Spain, the present work reflects on the need to recognize the health determinants associated to the veterinary profession within the characteristics of our labour market. The available data suggest that the occurrence of zoonoses as occupational diseases is underestimated in Spain. Therefore, performing surveys on occupational health, documenting and publishing cases and reviewing the risks and the impact of zoonotic diseases on the veterinary profession would contribute to the description and notification of such diseases on behalf of the healthcare administration and would also become an essential tool in occupational risk prevention

Zoonoses in Veterinary Students: A Systematic Review of the Literature.

BACKGROUND: Veterinary students face diverse potential sources of zoonotic pathogens since the first years of their academic degree. Such sources include different animal species and pathologic materials which are used at university facilities as well as commercial clinics, farms and other external facilities. OBJECTIVES: The present study utilizes a systematic review of the literature to identify zoonoses described in veterinary students. DATA SOURCES: Web of Science and PubMed. RESULTS: Of the 1,254 titles produced by the bibliographic search, 62 were included in this review. Whereas 28 of these articles (45.2%) described individual cases or outbreaks, the remaining 34 (54.8%) reported serological results. The zoonotic etiological agents described were bacteria, in 39 studies (62.9%), parasites, in 12 works (19.4%), virus, in 9 studies (14.5%) and fungi, in 2 (3.2%) of the selected articles. The selected literature included references from 24 different countries and covered the time period of the last 55 years. LIMITATIONS: The fact that common cases of disease or cases of little clinical importance without collective repercussions are not usually published in peer-reviewed journals limits the possibility to reach conclusions from a quantitative point of view. Furthermore, most of the selected works (66.1%) refer to European or North American countries, and thus, the number of cases due to pathogens which could appear more frequently in non-occidental countries might be underestimated. CONCLUSIONS/IMPLICATIONS: The results of the present systematic review highlight the need of including training in zoonotic diseases since the first years of Veterinary Science degrees, especially focusing on biosecurity measures (hygienic measures and the utilization of the personal protective equipment), as a way of protecting students, and on monitoring programs, so as to adequately advise affected students or students suspicious of enduring zoonoses.

Presence of Mycoplasma agalactiae in semen of naturally infected asymptomatic rams.

The purpose of the present study was to assess the presence of Mycoplasma agalactiae (Ma), the main causative agent of ovine contagious agalactia (CA), in semen of naturally infected rams. Therefore, semen samples from 167 rams residing in three different artificial insemination (AI) centers of a CA-endemic area were studied by microbiological and molecular techniques. In addition, serial ejaculates from the same rams were evaluated to determine the excretion dynamics of Ma. Of the 384 samples studied, Ma was detected in 56 (14.58%) which belonged to 44 different rams (26.35%). These findings confirm the ability of Ma to be excreted in semen of asymptomatic rams. Furthermore, these results also evidence the presence of these asymptomatic carriers of Ma in ovine AI centers, representing a serious health risk regarding the spread and maintenance of CA, especially in endemic areas. Moreover, the excretion of Ma in semen also points to the risk of venereal transmission of this disease. The current results highlight the need to implement control measures to prevent the admission of infected rams in AI centers and the necessity to continuously monitor semen samples to effectively detect infected individuals.

Survival of Mycoplasma agalactiae and Mycoplasma mycoides subspecies capri in heat treated goat colostrum.

The viability of Mycoplasma agalactiae and Mycoplasma mycoides subsp. capri (Mmc) was assessed in goat colostrum treated at different temperatures. Samples of colostrum were inoculated with reference strains of M. agalactiae (PG2) and Mmc (PG3) and heated at 56°C or 60°C for 0, 30, 60, 90 or 120 min. Viable colonies of M. agalactiae were recovered after all treatments and there was a significant reduction in the concentration of viable M. agalactiae after 30 min at 56°C and 60°C. No viable colonies of Mmc were observed after 60 min at 60°C.

Anatomic location of Mycoplasma mycoides subsp. capri and Mycoplasma agalactiae in naturally infected goat male auricular carriers.

This study sought to determine whether male goat auricular carriers of mycoplasmas known to cause contagious agalactia could harbour these microorganisms at anatomical sites other than the ears. A microbiological study was conducted in 6 naturally infected bucks that had been diagnosed as chronic auricular asymptomatic carriers of Mycoplasma (M.) mycoides subsp. capri (Mmc) more than one year previously. To detect mycoplasmas, cultures and PCR were performed on 46 samples taken from each goat from the cardio-respiratory, digestive, nervous, lymph and genitourinary systems and several joints. Of a total of 274 samples analyzed, 28 were positive for mycoplasmas (10.1%): Mmc was detected in 17 (6.1%), Mycoplasma (M.) agalactiae in 12 (4.3%) and both microorganisms were identified in one of the samples. In all 6 goats, mixed infection was observed despite none being auricular carriers of M. agalactiae. Mycoplasma spp. were identified at 15 different sites; the most frequent sites being the joints (31.2%, 5 positive samples), lymph nodes (25%, 4 positive samples) and respiratory tract (25%, 4 positive samples). Positive results were also obtained in three brain tissue (18.7%), two cardiac tissue (12.5%) and one ileum, urethra, testicle and bulbourethral gland (6.25%) samples. The histopathological findings may suggest the presence of mild chronic conditions in some of the organs where the bacteria were found. Our findings reveal for the first time the capacity of Mmc and M. agalactiae to colonize several other organ systems in chronically naturally infected auricular carriers, possibly representing an added risk factor for the spread of these microorganisms. In the case of M. agalactiae, colonization seemed to be independent of the animal's auricular carrier state.

Viability of Mycoplasma agalactiae and Mycoplasma mycoides subsp. capri in goat milk samples stored under different conditions.

Control programs for contagious agalactia (CA) involve monitoring milk samples to detect this disease. This study was designed to establish the effects of the preservatives generally used in dairy laboratories and storage temperature on the viability of Mycoplasma (M.) agalactiae (Ma) and M. mycoides subsp. capri (Mmc) in goat milk samples. In total, 1440 determinations were conducted for each mycoplasma species in milk samples subjected to different storage temperatures (refrigeration at 4°C or freezing at -20°C), preservation strategies (no preservative, NP; azidiol, AZ; or bronopol, BR) and storage times at each temperature (0, 2, 4, 6, 8, 10 and 24h at 4°C and 48h, 1 week, 2 weeks and 4 weeks at -20°C). Our findings reveal the similar viability of Mmc in milk samples stored at 4°C for 24h under the three preservation conditions examined. In contrast, the isolation of Ma in refrigerated milk samples was compromised by the presence of BR, and in smaller measure by the treatments AZ and NP. Freezing milk samples considerably reduced the viability of both mycoplasmas. Given the different sensitivity of the two mycoplasma species to BR, refrigerated milk samples treated with AZ could be used to detect infections caused by both species through culture-based methods.

Kinetics and role of antibodies against intimin beta in colostrum and in serum from goat kids and longitudinal study of attaching and effacing Escherichia coli in goat kids.

The presence of antibodies to the intimin beta-binding region (Int280-beta) of attaching and effacing Escherichia coli (AEEC) in serum from 20 goat kids from 2 herds, as well as in goat colostrum, was investigated by enzyme-linked immunosorbent assay. In addition, the onset and subsequent pattern of shedding of AEEC from the same goat kids over a 6-mo period was investigated. All the colostrum and serum samples tested contained antibodies against Int280-beta. The association between the antibody titer and the isolation of AEEC suggests that antibodies to intimin beta do not prevent colonization of the intestine by AEEC in goat kids. The AEEC were generally shed only transiently. Most AEEC isolated from the kids belonged to serogroup O26. Three isolates belonged to serogroup O157. These data show that goat kids may be a reservoir of AEEC that are potentially pathogenic for humans.

Latent infection of male goats with Mycoplasma agalactiae and Mycoplasma mycoides subspecies capri at an artificial insemination centre.

Contagious agalactia affects goats and is caused by several species of mycoplasma including Mycoplasma agalactiae and Mycoplasma mycoides subsp. capri (Mmc). Male goats, latently infected with M. agalactiae and Mmc, were identified at a dairy goat breeding artificial insemination centre. In three samplings, conducted over 1 year, ear swabs were assessed for both of the above organisms using culture and PCR techniques. Serological examination for antibodies against these organisms was performed at each time-point and conjunctival, nasal, rectal and preputial swabs were taken from a sub-sample of animals. Mycoplasma mycoides subsp. capri and M. agalactiae were detected in 80 and four ear swabs, respectively and serology confirmed the presence of both agents. A point prevalence of 0.06 goats infected with Mmc at the first sampling point increased to 0.97 at the last sampling, suggesting spread of infection. Both organisms were also detected in preputial and conjunctival swabs suggesting the shedding of these pathogens by other routes. These findings should inform World Organisation for Animal Health (OIE) guidelines on avoiding the introduction of such pathogens into artificial insemination centres and suggest the need to review current recommendations.

Comparison of culture and PCR to detect Mycoplasma agalactiae and Mycoplasma mycoides subsp. capri in ear swabs taken from goats.

This study was designed to evaluate the validity of PCR for the direct detection of Mycoplasma (M.) agalactiae and Mycoplasma mycoides subsp. capri (Mmc), as the two species most frequently causing contagious agalactia (CA) in goats. The PCR method was compared with the traditional culture technique to determine which method was most efficient at identifying all auricular carriers present in herds. The samples analyzed were 307 ear swabs taken from goats reared in a CA endemic area. We assessed the validity of each technique to detect each species and agreement between both methods. For each species, the result was taken as true-positive when at least one of the two tests was positive. Of the swabs tested, 246 were scored positive by PCR (235 and 11 for Mmc and M. agalactiae, respectively) and 117 showed a positive culture result (113 for Mmc and 4 for M. agalactiae). 133 of the PCR-positive samples (124 and 9 for Mmc and M. agalactiae, respectively) yielded negative culture results and 4 culture-positive samples tested negative using PCR (2 for each species). Sensitivity and negative predictive values for PCR were 84.62 and 99.32 (for M. agalactiae) and 99.16 and 97.22% (for Mmc) respectively, and for culture were 30.77 and 97.03 (for M. agalactiae) and 47.08 and 36.08% (for Mmc), respectively. PCR proved to be a rapid and sensitive method for the detection of mycoplasmas in the external ear of asymptomatic carriers. Tools such as this are needed to adopt efficient control measures against CA.

A survey of Salmonella spp and Campylobacter spp in dairy goat faeces and bulk tank milk in the Murcia region of Spain.

This study was designed to investigate the occurrence of Salmonella spp and Campylobacter spp in faeces samples from 222 healthy Murciano-Granadina dairy goats reared on 12 farms in Spain and in samples of bulk tank milk from 11 of those herds. Neither Salmonella spp nor Campylobacter spp were isolated from any of the samples. Our results suggest that, under the management practices applied to this breed in Spain, Murciano-Granadina goats are not likely to be a significant reservoir for these food-borne pathogens.

Influence of intramammary infection and non-infection factors on somatic cell counts in dairy goats.

A total of 1304 goat udder halves were sampled monthly during an entire lactation (6262 samples) with the aim of identifying factors affecting milk somatic cell count (SCC). Bacteriological analyses for identification of mastitis pathogens were carried out on all samples and SCC was also determined. All animals were examined for infection by caprine arthritis-encephalitis virus (CAEV) using a commercial ELISA test kit. Results obtained were arranged in two databases (whole-lactation average half-udder database and monthly half-udder database) and two mixed models were applied. Random effects of half udder nested into flock and fixed effects of flock, intramammary infection (IMI) status, number of kids born, length of lactation and interaction of parity with IMI status were significant for the first database. CAEV infection and its interaction with IMI status was not significant. Milk SCC was significantly increased for infected udder halves and milk from udder halves infected with minor pathogens had lower SCC than udder halves infected with major pathogens. For healthy udder halves, SCC was higher in older animals but this effect was not evident in halves with IMI. Multiple birth and short-duration lactation were factors associated with elevated milk SCC. The second mixed model considered repeated measures in time for consecutive samplings throughout lactation (stage of lactation) which was also a significant factor with increasing stage of lactation. The influence of all these factors should be taken into account in the establishment of more reliable diagnostic SCC thresholds for IMI.

Economia y medio ambiente-medio ambiente y economia: una dialectica para el proximo milenio

Marco teorico paradigmas economicos y recursos naturales renovables. Valoracion economica de los daños ambientales ocasionados por las actividades humanas. Precios sombra de los recursos naturales renovables. Internalizacion de las externalidades. Cuentas patrimoniales. Consideraciones finales. Consideraciones previas. Diagnostico. Estructura fiscal. Un intento de ambientalizar las actividades del PIB. El manejo del recurso base: la tierra y sus externalidades. Un nuevo modelo nacional de industrializacion. Variables soiales y su nexo con el medio