Recurrent COVID-19 including evidence of reinfection and enhanced severity in thirty Brazilian healthcare workers
Letícia Adrielle dos Santos, Pedro Germano de Góis Filho, Ana Maria Fantini Silva, João Victor Gomes dos Santos, Douglas Siqueira Santos, Marília Marques Aquino, Rafaela Mota de Jesus, Maria Luíza Dória Almeida, João S. Silva, Daniel M. Altmann, Rosemary J. Boyton, Cliomar Alves dos Santos, Camilla Natália Oliveira Santos, Juliana Cardoso Alves, Ianaline Lima Santos, Lucas Sousa Magalhães, Emilia M.M.A. Belitardo, Danilo J. P. G. Rocha, João Paulo P. de Almeida, Luis G. C. Pacheco, Eric Roberto Guimarães Rocha Aguiar, Gúbio Soares Campos, Sílvia Inês Sardi, Rejane Hughes Carvalho, Amélia Ribeiro de Jesus, Karla Freire Rezende, Roque Pacheco de Almeida
Abstract
BACKGROUND: There is growing concern about individuals reported to suffer repeat COVID-19 disease episodes, these in a small number of cases characterised as de novo infections with distinct sequences, indicative of insufficient protective immunity even in the short term. METHODS: Observational case series and case-control studies reporting 33 cases of recurrent, symptomatic, qRT-PCR positive COVID-19. Recurrent disease was defined as symptomatic recurrence after symptom-free clinical recovery, with release from isolation >14 days from the beginning of symptoms confirmed by qRT-PCR. The case control study-design compared this group of patients with a control group of 62 patients randomly selected from the same COVID-19 database. RESULTS: Of 33 recurrent COVID-19 patients, 26 were female and 30 were HCW. Mean time to recurrence was 50.5 days which was associated with being a HCW (OR 36.4 (p <0.0001)), and blood type A (OR 4.8 (p = 0.002)). SARS-CoV-2 antibodies were signifcantly lower in recurrent patients after initial COVID-19 (2.4 ± 0.610; p<0.0001) and after recurrence (6.4 ± 11.34; p = 0.007). Virus genome sequencing identified reinfection by a different isolate in one patient. CONCLUSIONS: This is the first detailed case series showing COVID-19 recurrence with qRT-PCR positivity. For one individual detection of phylogenetically distinct genomic sequences in the first and second episodes confirmed bona fide renfection, but in most cases the data do not formally distinguish between reinfection and re-emergence of a chronic infection reservoir. These episodes were significantly associated with reduced Ab response during initial disease and argue the need for ongoing vigilance without an assumption of protection after a first episode.