PMC:7510993 / 28903-29838
Annnotations
{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7510993","sourcedb":"PMC","sourceid":"7510993","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7510993","text":"l, were countries with high temperature and humidity that are characterized by lower cross-border mobility and more BCG vaccination. The type D countries, with less than 1,000 COVID-19 cases per million in which the infection spread peaked after mid-June, were mostly tropical developing countries with lower population density, less cross-border mobility, higher malaria incidence, and less BCG vaccination. These country-specific factors indicate that the COVID-19 spread is not simply driven by specific environmental variables, and the underlying mechanisms are complicated (Table 1). Therefore, evaluating the drivers of the COVID-19 spread at the present phase of disease expansion is a challenging task.\nThe absence of population-wide testing for COVID-19 makes it difficult to investigate the growth dynamics of COVID-19 infection. 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