Latent period is time between infection and becoming infectious. Three important time periods: incubation, latent, and infectious. Pathogens enter host through portal of entry after successful transmission
Cohort study samples groups sharing common characteristics over time. No intervention or control group is administered. Participants are followed to observe disease incidence rates. Can be retrospective (using existing data) or prospective (collecting new data)
Journal traces back to 1901 as predecessor to Journal of Hygiene. Currently published by Cambridge University. Editor-in-Chief is Dr Susan Hahné from Netherlands. Publishes 15-20 articles monthly online
Data comes from WHO, which publishes weekly updates since March 2020. Cases are categorized as suspected, probable, or confirmed. WHO defines confirmed cases as those with positive laboratory tests
Incidence rate measures new event occurrence over specified time period. Calculated by dividing new cases by total population at risk. Only new cases considered, not previously diagnosed ones
Epidemic describes disease outbreak spreading rapidly in limited region. Pandemic refers to global epidemic affecting multiple countries or continents. Endemic describes constant presence of disease in geographic population