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Global rates of chikungunya infection are variable, depending on outbreaks. When chikungunya was first identified in 1952, it had a low-level circulation in West Africa, with infection rates linked to rainfall. Beginning in the 1960s, periodic outbreaks were documented in Asia and Africa.
Outbreaks of chikungunya, on average, have low mortality rates. [2] As it is generally a nonfatal disease, prevalence rates during most outbreaks are higher than incidence rates. [6] Recently, it was discovered that approximately 39% of the worldwide population resides in environments where the chikungunya virus is endemic. [7]
Chikungunya is characterized by a sudden high fever and intense joint pain, between four and seven days after infection. [4] [7] It can also cause headaches, muscle pain, fatigue, and rashes. [8] Most infected patients recover within 10 days, and deaths are rare. However, in some cases joint pain can linger for months or years.
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
is the average number of people infected from one other person. For example, Ebola has an of two, so on average, a person who has Ebola will pass it on to two other people.. In epidemiology, the basic reproduction number, or basic reproductive number (sometimes called basic reproduction ratio or basic reproductive rate), denoted (pronounced R nought or R zero), [1] of an infection is the ...
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An infection rate or incident rate is the probability or risk of an infection in a population. It is used to measure the frequency of occurrence of new instances of ...
Throughout the 20th century until 1980, with the exception of the 1918 Spanish flu pandemic, the death rate from infectious diseases in the United States was steadily decreasing. However, because of the AIDS epidemic, the death rate from infectious diseases increased by 58% between 1980 and 1992.
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