Breakthrough Infections of SARS-CoV-2 Gamma Variant in Fully Vaccinated Gold Miners, French Guiana, 2021
, Vincent Bérot1
, Nathalie Bonnave, Sandrine Peugny, Mathilde Ballet, Estelle Jacoud, Céline Michaud, Mélanie Gaillet, Félix Djossou, Denis Blanchet, Anne Lavergne, Magalie Demar, Mathieu Nacher, Dominique Rousset, and Loïc Epelboin
Author affiliations: Institut Pierre Louis d’Épidémiologie et de Santé Publique Inserm UMR1136, Paris, France (N. Vignier); Université Sorbonne Paris Nord, Bobigny, France (N. Vignier); Centre Hospitalier de Cayenne, Cayenne, French Guiana (N. Vignier, V. Bérot, N. Bonnave, S. Peugny, E. Jacoud, C. Michaud, M. Gaillet, F. Djossou, D. Blanchet, M. Demar, M. Nacher, L. Epelboin); Centre d’Investigation Clinique Antilles Guyane Inserm 1424, Cayenne (N. Vignier, M. Nacher, L. Epelboin); Centre Hospitalier Ouest Guyanais, Saint Laurent du Maroni, French Guiana (V. Bérot); Agence Régionale de la Santé de Guyane, Cayenne (M. Ballet); Institut Pasteur de la Guyane, Cayenne (A. Lavergne, D. Rousset)
Figure. Epidemic curve for symptomatic and asymptomatic COVID-19 case-patients, by date of symptom onset or date of PCR, during an outbreak in gold-mine workers in French Guiana, May 29–June 8, 2021. Of the case-patients with undated history of COVID-19, case-patient 7 had a high level of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies, probably from an old infection. Case-patients 23 and 26 had low levels of antibodies, indicating either recent or very old infection. Case-patient 40 was positive by PCR with cycle threshold = 33 on June 2 and had a high level of SARS-CoV-2 antibodies, indicating possible semi-recent infection dating back a few days or weeks. COVID-19, coronavirus disease; UHCn, undated history of COVID-19 (positive serology) with negative PCR, not vaccinated.
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