The incidence and geographical spread of SARS-CoV-2 in Rio de Janeiro, Brazil based on RT-PCR test results

Here, 87,442 reverse transcription polymerase chain reaction (RT-PCR) test results for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) were reported among Rio de Janeiro residents (March to September 2020).

RESULTS

Overall, RT-PCR positivity of 44.6% decreased over time towards 20%. Positivity was greater among males (OR=1.22; 95%CI:1.19-1.26); Black (OR=1.10; 95%CI:1.02-1.19), Brown (OR=1.16; 95%CI:1.10-1.22), and indigenous people (OR=2.11; 95%CI:0.88-5.03) compared to Whites and increased with age; with epidemic spread from the capital to inland regions.

CONCLUSIONS

SARS-CoV-2 keeps spreading in Rio de Janeiro, and reopening of activities may fuel the epidemic.

Keywords:
SARS-CoV-2; COVID-19; Epidemiology; Surveillance; Brazil

Variables	N	Prevalence (%)	Odds ratio	95%CI	p-value
Sex
Female	48,616	42.2	-
Male	38,586	47.4	1.22	1.19-1.26	<0.001
Age group (years)
<10	2,015	15.0	-
10-19	2,228	22.2	1.61	1.38-1.89
20-29	11,055	34.5	2.98	2.62-3.39
30-39	17,907	42.4	4.16	3.67-4.72	<0.001*
40-49	17,165	45.8	4.78	4.21-5.42
50-59	14,140	47.7	5.15	4.54-5.85
60-69	10,561	51.7	6.07	5.34-6.89
70+	12,168	53.8	6.59	5.80-7.49
Race / skin color
White	23,811	40.3	-
Black	5,832	42.7	1.10	1.02-1.19	0.002
Brown	14,653	44.0	1.16	1.10-1.22	<0.001
Asian	5,378	40.2	0.92	0.94-1.07	1.000
Indigenous	34	58.8	2.11	0.88-5.03	0.125
Region of residence
North (Norte)	2,666	26.4	-
Northwest (Noroeste)	4,009	29.6	1.17	1.00-1.36	0.041
South Center (Centro-Sul)	4,030	31.7	1.29	1.11-1.51	<0.001
Middle Paraíba (Médio Paraíba)	11,368	37.5	1.66	1.46-1.90	<0.001
Mountains (Serrana)	6,697	37.9	1.70	1.47-1.95	<0.001
Coastal Lowland (Baixada Litorânea)	7,526	40.6	1.90	1.65-2.18	<0.001
Ilha Grande Bay (Baía da Ilha Grande)	1,645	46.5	2.42	2.01-2.91	<0.001
Rio de Janeiro city	28,239	50.5	2.84	2.50-3.22	<0.001
Metropolitan II (Metropolitana II)	7,303	50.5	2.84	2.47-3.25	<0.001
Metropolitan I (Metropolitana I)	12,791	52.6	3.09	2.71-3.53	<0.001

Sociedade Brasileira de Medicina Tropical - SBMT Caixa Postal 118, 38001-970 Uberaba MG Brazil, Tel.: +55 34 3318-5255 / +55 34 3318-5636/ +55 34 3318-5287, http://rsbmt.org.br/ - Uberaba - MG - Brazil
E-mail: rsbmt@uftm.edu.br

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[1] Corresponding author: Dr. Guilherme Loureiro Werneck. e-mail:gwerneck@iesc.ufrj.br