Keppel Street
London , WC1E 7HT
United Kingdom
COVID-19; SARS-CoV-2; Schools; Transmission; Contacts; Testing; Secondary Attack Rate
Seroprevalence, COVID-19, SARS-CoV-2, Bolivia, low- and middle-income countries, vaccination, prevention & control, epidemiological surveillance
COVID-19 vaccine, risk factors, vaccine uptake, adolescents, ethnicity