The Wood equation allows consistent fitting of individual antibody-response profiles of Zika virus or SARS-CoV-2 infected patients.

Antibody kinetic curves obtained during a viral infection are often fitted using aggregated patient data, hiding the heterogeneity of individual humoral immune responses. Individual antibody responses can be modeled using the Wood equation and grouped according to their profile. Such modeling takes into account several important kinetic parameters, such as the day when antibody detection becomes positive [daypos], the day of the maximal response [daymax], the maximum antibody level [levelmax], and the day when antibody detection becomes negative [dayneg]. Potential associations between these profiles and studied factors can then be tested.

[The French Armed Forces Biomedical Research Institute (IRBA) and wastewater-based epidemiology: Applicability and relevance in armed forces]. / L'Institut de recherche biomédicale des armées (IRBA) et l'épidémiologie des eaux usées : intérêt pour les forces armées.

The French Armed Forces Biomedical Research Institute (IRBA) deeply involved in research on SARS-COV-2, participated in the creation of the Obépine sentinel network in charge of detecting, qualifying and quantifying the virus genome in wastewater in France. During this pandemic, wastewater-based epidemiology has proven to be a first class public health tool for assessing viral dynamics in populations and environment. Obépine has also conducted research demonstrating the low infectivity of faeces and wastewater and allowed for early detection of epidemic waves linked to new variants. The IRBA has adapted this powerful tool to the monitoring of viral infections on board the aircraft carrier Charles-de-Gaulle in order to get an operational system for anticipation after the first local outbreak in 2020. The presence of this surveillance and anticipation tool has allowed a better management of SARS-CoV-2 contingent introductions on board during stopovers or crewmembers entries. The combination of a mandatory vaccination protocol and the surveillance of viral circulation in black waters has made it possible to identify and locate cases, and thus to continue the operational mission in the COVID-19 environment while limiting the spread and preserving the health of the crew. This innovative tool can easily be redirected to the search for any other pathogens in blackwater or even, in the long term, to ensure health surveillance of any military establishment, at sea or on land, in France or on overseas bases.

Immunization on the French Armed Forces: Impact, organization, limits and perspectives.

Vaccination plays a key role in the prevention of the infectious diseases, which the armed forces are exposed to during overseas deployments. Historically, the French military health service have always contributed greatly to progress in vaccination. The military immunization schedule has often been used as a model for the national schedule. It is a powerful tool, which is constantly evolving to take into account the risks of infection inherent in deployment and to include new scientific data, while still remaining aware of the limitations of vaccination from an individual and collective standpoint. In the current context of increasingly fast emergence or re-emergence of pathogens with a high epidemic potential, developing preventive medical measures is more necessary than ever before, and the French military health service is actively participating.

hCD46 receptor is not required for measles vaccine Schwarz strain replication in vivo: Type-I IFN is the species barrier in mice.

Measles virus has been successfully attenuated on chicken embryo cells to obtain a highly efficient and safe live attenuated vaccine, administered thus far to billions of children. Measles virus attenuation has long been described to involve a modification of cellular tropism with the use of human CD46 ubiquitous receptor. Nevertheless, the use of this receptor in vivo is not obvious. In this study we use four different mouse models to decipher the respective part of hCD46 receptor and type-I interferon response in measles host restriction. We observed that only type-I interferon restricts viral replication of attenuated MV Schwarz strain in mice, independently of the presence of hCD46 receptor. By comparing measles virus immunogenicity in the different models, we confirmed that there was no impact on the absence of this receptor on the immune response. Therefore, we propose to simplify the mouse model.

Gulf war syndrome: could it be triggered by biological warfare-vaccines using pertussis as an adjuvant?

Several recent epidemiological studies have shown that vaccinations against biological warfare using pertussis as an adjuvant were associated with the Gulf war syndrome. If such epidemiological findings are confirmed, we propose that the use of pertussis as an adjuvant could trigger neurodegeneration through induction of interleukin-1beta secretion in the brain. In turn, neuronal lesions may be sustained by stress or neurotoxic chemical combinations. Particular susceptibility for IL-1beta secretion and potential distant neuronal damage could provide an explanation for the diversity of the symptoms observed on veterans.

[The Gulf war syndrome]. / Le syndrome de la guerre du Golfe.

SPARSE DATA: The Gulf war syndrome remains a little know entity since its first appearance 10 years ago. The objective of our work was to synthesize the data published on the subject in the scientific literature. We analysed the results of American and English epidemiological surveys, from which it was difficult to distinguish the existence of a univocal syndrome. IMPRECISE DEFINITION: It is difficult to give a clear clinical definition of the syndrome, the signs of which fluctuate depending on the studies. Chronic fatigue is frequently associated with the Gulf war syndrome, although some studies have described electrophysiological neurological lesions. NUMEROUS HYPOTHESES: The role of stress, vaccinations and their adjuvants, exposition to neurotoxic substances and weak uranium have been incriminated. We propose that multiple factors be integrated in the research for the genesis of this atypic syndrome.

Chronic restraint stress induces severe disruption of the T-cell specific response to tetanus toxin vaccine.

Chronic stress is known to induce immunological disorders. In the present study we examined the consequences of chronic restraint stress on the immune response to tetanus toxin in mice. We investigated the repartition of subsets of lymphoid cells in blood and spleen, the functional ability of lymphocytes to proliferate and to produce cytokines, and antibody titres against tetanus toxin following stress. We report discordance of the stimulation index of lymphocytes in the restraint group: the proliferating rate severely decreased following stimulation with a relevant antigen, whereas it increased with mitogen. Thus, we report a decrease in cytokine production with relevant antigen (interferon-gamma and interleukin-10), without a T helper type 1 and 2 secretion imbalance. Moreover, we observed an alteration in the humoral response, including a delay in isotype maturation and an immunoglobulin G1/G2a imbalance.

[Natural biological risks and military biological risks]. / Risque biologique naturel et risque biologique militaire.

The Iraqi biological program, the activities of sect Aum in Japan and the extensive endemicity of plague prove the existence of military, terrorist and natural biological risks. Among the agents of natural risk (viruses, bacteria.), plague is induced by modification of the ecosystem. Present since 1921 in the high plateau of Madagaskar, the disease evolves under two modes, endemic (natural) or epidemic (urban). Since the control of endemicity is impossible, the decrease of incidence will be obtained by the control of the animal reservoir. The military risk is part of the history of armed conquests. Anthrax and botulinum toxins, are the most toxic agents, banned by the Convention of London (1972). In 1995, 4 years after the end of Gulf war, UNSCOM obtained from authorities the inventory of Iraqi biological program, with details on the militarization of toxins and spores. These furtive weapons, are produced with limited technological skills, often in dual manufactures and are difficult to control.