SARS-CoV-2 positivity rates in asymptomatic workers at a cancer referral center in Mexico City: a prospective observational study in the context of adapting hospitals back to regular practice

Noverón, Nancy Reynoso; Peralta, Liliana Pérez; Compte, Diana Vilar; Montalvo, Luis Alonso Herrera; Pineda, Sarahí R Gallardo; Gómez, Adriana Areli Gudiño; Vega, Oscar Antonio Ramírez; Gutiérrez, Rodrigo Cáceres; Miranda, Alfredo Hidalgo; Vargas, Alfredo Mendoza; Martínez, Daniel de la Rosa; Juárez, Patricia Cornejo; García, Abelardo A Meneses

BACKGROUND: : Healthcare workers are at increased risk of SARS-CoV-2 infection. The positivity rates in hospitals that do not receive patients with COVID-19, such as the National Cancer Institute (INCan) in Mexico, and the associated factors are unknown. OBJECTIVE: : To assess the incidence and factors associated with SARS-CoV-2 infection in health workers at INCan. METHODS: : A cohort study of 531 workers who were followed for 6 months. RT-PCR analysis of saliva and nasopharyngeal swab samples were used in the baseline and to confirm cases during follow-up The incidence rate ratio was calculated according to the measured characteristics and the associated factors were calculated using logistic regression models. RESULTS: : Out of 531 workers, 9.6% tested positive for SARS-CoV-2, Being male (RR: 2.07, 95% CI: 1.1-3.8, p=0.02), performing administrative tasks (RR: 1.99, 95% CI: 1.0-3.9, p=0.04), and having relatives also working at INCan (RR: 3.7, 95% CI: 1.4-9.5, p<0.01) were associated with higher positivity rates. DISCUSSION: : Incidence of positive cases in health workers were similar to that reported in non-COVID hospitals from other countries. CONCLUSIONS: : Even though active surveillance helped to detect a significant number of asymptomatic infections, it is still necessary to reinforce preventive measures in non-medical staff to prevent nosocomial transmission.