Fig. 3

Number of articles in each publication category. Numbers on February 11, 2022. The definitions for the publication categories are: mechanism: underlying cause(s) of COVID-19 infections and transmission and possible drug mechanism of action; transmission: characteristics and modes of covid-19 transmissions, such as human-to-human, diagnosis: disease assessment through symptoms, test results, and radiological features; prevention: prevention, control, response, and management strategies; forecasting: modelling and estimating the trend of COVID-19 spread; health equity: relevant to health equity and search terms are derived from a list provided by the Association for Territorial Health Officials which include terms such as diversity, health disparities, and others; vaccine: relevant to vaccine development, evaluation, implementation and impact; variant: relevant to SARS-CoV-2 variants and their impact on public health; surveillance: relevant to SARS-CoV-2 public health surveillance and tracking