Epidemic curve

An epidemic curve, also known as an epi curve or epidemiological curve, is a statistical chart used in epidemiology to visualise the onset of a disease outbreak. It can help with the identification of the mode of transmission of the disease. It can also show the disease's magnitude, its outliers, its trend over time, and its incubation period. It can give outbreak investigators an idea as to whether an outbreak is likely to be from a point source, a continuous common source, or a propagated source.
Epidemic curves generally show the frequency of new cases compared to the date of disease onset.


Yellow Fever

2019–20 coronavirus pandemic

The first description of epidemiological curves from the 2019–20 coronavirus pandemic showed the pattern of a "mixed outbreak". According to the investigators, there was likely a continuous common source outbreak at Wuhan Seafood Market in December 2019, potentially from several zoonotic events. As of the date of publication of the study, it is unknown which animal may have been the original reservoir of the virus, or how it was originally transmitted to humans. Following this, the investigators found that the outbreak likely became a propagated source, meaning that the virus became able to be transmitted from person to person. The New York Times has published a curve simulator for both the USA and the world, on which the visitor can tinker the base parameters to get various outcomes.