ABSTRACT
Desde el año 2013 es frecuente encontrar a la medusa Liriope tetraphylla en las costas de Monte Hermoso y zonas aledañas de la Provincia de Buenos Aires. En los últimos años se ha podido registrar un número importante de afectados por picaduras de Liriope tetraphylla. Cuando las picaduras son abundantes producen el fenómeno de "tapioca" o "pica- pica", provocando en forma inmediata ardor leve y luego lesiones pápulo-eritema-edematosas con picazón intensa. Las lesiones tienen una distribución específica en zonas de flexión corporal y lugares cubiertos por el traje de baño. El día 15 de febrero de 2015 se registró un "bloom" de L. tetraphylla, con una densidad de 605 individuos/m3, que se vio reflejado en el gran número de personas afectadas que ingresaron el Servicio de Emergencias del Hospital Municipal de Monte Hermoso "Dr. Ramón Carrillo" el día 16 de febrero de 2015. De un número total de 71 pacientes adultos que ingresaron ese día al Servicio, fueron atendidos por dermatitis asociada al contacto con "tapioca" 19 de ellos (26.80%),y de un total de 69 pacientes pediátricos, 49 de ellos (71%) fueron tratados por la misma afección. En el presente trabajo se detallan los síntomas causados por "tapioca" en base a 68 casos tratados. Se describe el tratamiento utilizado y métodos de prevención para las lesiones, así como su relación con el bloom de la especie de aguaviva en cuestión.
Since the summer of 2013 the sea medusa Liriope tetraphylla was found frequently on the shores of Monte Hermoso and nearby beaches in Buenos Aires Province. Recently, there has been a significant number of sea bathers affected by Liriope tetraphylla bites. When the bites are numerous, a phenomenon called "tapioca" or "pica - pica" occurs, thus causing immediate mild burning followed by erythematous-edematous papulas and intense itching. Lesions have a specific distribution in body flexion parts and body areas covered by the bathing suit. In February 15, 2015 there was a L. tetraphylla bloom, recording a density of 605 individuals/m3, that caused a large number of sea bathers to present dermatitis and receive treatment at the Emergency Service of Dr. Ramón Carrillo Hospital in Monte Hermoso. On this day, 19 out of 71 adults (26.80%) and 49 out of 69 children (71%) who were treated at the Emergency Service showed clinical profiles compatible with the contact with the sea medusa. In this work, the symptoms caused by "tapioca" based on 68 cases are described in detail, as well as the medical treatment applied, the preventive methods for medusa bites, and the relation with the medusa bloom.
Subject(s)
Humans , Hydrozoa , Dermatitis , Skin Irritancy Tests , Degloving InjuriesABSTRACT
Necropsy on 15 specimens of white-tufted grebe, Rollandiarolland, caught in the Mar Chiquita and Chascomús lagoons (Buenos Aires province), revealed the presence of Contracaecumovale (Linstow, 1907). This nematode shows a marked specificity for podicipediform birds. The specimens were identified from morphological study on features such as cephalic and esophageal structures and caudal papillae, using both optical and scanning electron microscopy. This is the first record of C. ovale parasitizing R. rolland in Argentina.
Necropsia de 15 espécimes de mergulhão-de-orelha-branca, Rollandiarolland, coletados nas lagoas Mar Chiquita e Chascomús (Província de Buenos Aires), revelou a presença de Contracaecumovale (Linstow, 1907). Esse nematóide tem uma marcada especificidade pelas aves podicipediformes. Os espécimes foram identificados a partir de características, tais como estruturas morfológicas cefálicas e esofágicas e papilas caudais, utilizando-se microscopia óptica e microscopia eletrônica de varredura (MEV). Esse é o primeiro registro de C. ovale parasito de R. rolland na Argentina.
Subject(s)
Animals , Birds/parasitology , Nematoda/parasitology , ArgentinaABSTRACT
The pejerrey Odontesthes bonariensis is the most important freshwater fish of Argentina central region. The present study was conducted to describe the seasonal variation of parasitism in O. bonariensis from La Viña reservoir (31º 17'S, 65º 01'W), located in the province of Córdoba, Argentina. Between years 1999 and 2002, 573 fishes were caught, and their parasite infection and relative weight (Wr) were assesed. Three parasites were found, Lernaea cyprinacea (Crustacea), Contracaecum spp. larvae (Nematoda) and Cangatiella macdonaghi (Cestoda). Overall, Contracaecum spp. prevalence and intensity were very low. Lernaea cyprinacea and Cangatiella macdonaghi prevalences increased during summer and spring (P < 0.01), respectively. Lernaea cyprinacea infection showed also seasonal differences in intensity (P < 0.05), as well as C. macdonaghi regarding parasites density (P < 0.01). Cangatiella macdonaghi average parasites density was 32.0 (±22.5) cestodes per cm³ of digestive content. No association between parasitism and fish relative weight was found. Besides the seasonality variations observed, the parasite burden found did not compromise fish body condition.
O peixe rei Odontesthes bonariensis é um peixe de água doce de grande importância na região central da Argentina. O objetivo deste trabalho foi descrever a sazonalidade do parasitismo de O. bonariensis no reservatrio La Viña (31º 17'S, 65º 01'W), província de Córdoba, Argentina. Durante os anos 1999 e 2002 foram capturados 573 peixes. Nestes se fez à avaliação da condição corporal usando como parâmetro o peso relativo e identificaram-se os seguintes parasitos: Lernaea cyprinacea (Crustacea), Contracaecum spp. (Nematoda) e Cangatiella macdonaghi (Cestoda). As prevalências e intensidades de Contracaecum spp. foram muito baixas. Houve diferenças nas prevalências de L. cyprinacea e C. macdonaghi na época do ano (P < 0,01), sendo maiores no verão e na primavera, respectivamente. Houve diferenças estacionais na intensidade de L. cyprinacea (P < 0,05) e na densidade de C. macdonaghi (P < 0,01), neste ultimo alcançou-se um valor máximo nas amostras de 32,0 (±22,5) parasitos por cm³ de conteúdo digestivo. Não houve associação entre o parasitismo e o peso relativo dos peixes. Embora haja certa sazonalidade, as diferentes cargas parasitárias encontradas nâo prejudicam a saúde de O. bonariensis enquanto sua condição corporal.
Subject(s)
Animals , Fishes/parasitology , Argentina , Fresh Water , SeasonsABSTRACT
Objetivos: En el presente tra bajo, se dan a conocer las especies de nematodes anisákidos que parasitan peces destinados al consumo humano y valores de prevalencia e intensidad de infección, evaluando el riesgo potencial que representa el consumo de carne sin la debida cocción de estas especies. Resultados: Se examinaron 1250 ejemplares de peces marinos del estuario de Bahía Blanca, pertenecientes a 22 especies, consideradas habituales en el área. En los peces examinados se identificaron nematodes anisákidos al estadio de larva 3 (L3), pertenecientes a cinco géneros: Anisakis, Pseudoterranova, Contracaecum, Hysterothylacium y Terranova. Catorce especies de peces resultaron parasitadas por al menos una especie de anisákido, en tanto sólo la pescadilla y la palometa albergaron larvas de Anisakis sp. Sin embargo, la intensidad media de infección y la abundancia en la pescadilla tienen valores muy bajos, no habiéndose registrado su presencia más que en la cavidad visceral. En el caso de la palometa, la intensidad absoluta de infección suele ser mayor, pero la prevalencia es menor que en la pescadilla. Además, tampoco se han reportado casos de invasión muscular en el filet de palometa. En el resto de los peces examinados los estimadores poblacionales son muy fluctuantes, pero un común denominador es la baja intensidad media en todos ellos, no llegando a superar los 2-3 individuos por hospedador. Conclusiones: El 63% de las especies examinadas en el estuario de Bahía Blanca y áreas adyacentes albergan larvas de anisákidos. La forma dominante es Contracaecum, que cierra su ciclo de transmisión en lobos marinos, seguida por Terranova, que completa su madurez sexual en tiburones. Los peces cartilaginosos presentaron larvas en el lumen intestinal, procedentes de presas digeridas, no observándose invasión por anisákidos a la cavidad corporal. No se comprobó infección a la musculatura estriada esquelética de los peces, por Anisakis ni Pseudoterranova.
ABSTRACT Objectives: In this work, anisakid nematode species parasiting on fish for human consumption and values of prevalence and intensity of infection are reported, thus assessing the potential risk represented by consumption of the improperly cooked fish meat of these species. Results: 1250 specimens of marine fish from Bahía Blanca estuary, belonging to 22 common species in this area, were examined. In the fish under study, anisakid nematodes at larva stage 3 (L3) belonging to five genera were identified: Anisakis, Pseudoterranova, Contracaecum, Hysterothylacium, and Terranova. Fourteen fish species were parasitized by at least one anisakid species. However, only the striped weakfish and the Argentine queen fish harbored Anisakis sp. larvae and mean infection intensity as well as striped weakfish abundance show very low values. Infection was only detected in the visceral cavity. In the case of the Argentine queen fish, the absolute infection intensity is generally higher, although prevalence is lower than in striped weakfish. In addition, no muscular invasion cases were reported in striped weakfish filet. In the rest of the fish examined, population estimators are quite variable. However, a common feature is the low mean intensity in all of them, less than 2-3 individuals by host. Conclusions: 63% of fish species examined in Bahía Blanca estuary and nearby areas harbor anisakid larvae. Contracaecum larvae were the dominant anisakids found in the fish, which complete their transmission cycle in seals, followed by Terranova, which complete their sexual maturity in sharks. Cartilaginous fish presented larvae located in the intestinal lumen from the prey digested. However, no invasion of anisakids was observed in the body cavity and no infection by Anisakis or Pseudoterranova was found in the striated somatic muscles of fish.