Uncertainties beyond preparedness: COVID-19 vaccination in Senegal.

Vaccination is one of the most recognised strategies in public health for preventing the spread of epidemics, and the availability of a vaccine is often expected by health actors to be a 'game-changer'. However, the COVID-19 (coronavirus disease 2019) vaccine in Senegal was not the magic bullet that the international community expected. A very low vaccination coverage rate (less than 10% by April 2023) was observed in this country, once considered a model in West Africa for its epidemic response.

[Preparing for epidemics. A strategy for strengthening social science skills in Africa].

The Covid pandemic was a reminder of the need to be prepared for epidemics and pandemics and to take into account their socio-political dimensions by developing socioanthropological and interdisciplinary approaches. In the post-crisis era, the challenge is one of operationality. How can these dimensions be made more visible? How can we develop analyses that can help to humanize institutional responses, make inequalities visible to limit them during the crisis, reveal structural determinants of transmission, and define interventions that are scientifically sound, ethically just and respectful of diversity?Three strategies are relevant to meet these challenges: (1) more social scientists in Frenchspeaking Africa must get expertise on epidemics to investigate associated issues before, during and after epidemic crisis; (2) public health professionals, health and social workers must get informed about social, historical, economic and political aspects of epidemics that shape risk, care and control; (3) collaborations between researchers and those involved in responding to epidemics on the basis of shared knowledge must develop.

External standard calibration method for high-repetition-rate shock tube kinetic studies with synchrotron-based time-of-flight mass spectrometry.

The signal levels observed from mass spectrometers coupled by molecular beam sampling to shock tubes are impacted by dynamic pressures in the spectrometer due to rapid pressure changes in the shock tube. Accounting for the impact of the pressure changes is essential if absolute concentrations of species are to be measured. Obtaining such a correction for spectrometers operated with vacuum ultra violet photoionization has been challenging.