Uma análise de factores ambientais na evolução da doença indica que a evolução e determinada por factores sazonais.
Séculos de clínica e epidemiologia sempre disseram que as infeções respiratórias são sazonais. Tudo deitado na sanita em nome da carreira de meia dúzia.
per increase in ambient temperature of 1°C to be 0.854 (0.773–0.944, p = 0.007). Statistically significant decreases of comparable magnitude in median hospital stay, probability of transfer to the intensive care unit, and need for mechanical ventilation were also observed in most, but not all hospitals. The analysis of individually reported symptoms of 37,187 individuals in the UK also showed the decrease in symptom duration and disease severity with time.
Interpretation: Severity of COVID-19 in Europe decreased significantly between March and May and the seasonality of COVID-19 is the most likely explanation
Um outro artigo na Nature encontra fortissima correlação com a latitude, logo com sazonalidade
The results indicate that a low 25(OH)D concentration is a contributing factor to COVID-19 severity, which, combined with previous studies, provides a convincing set of evidence.