The outbreaks of major respiratory diseases in the past century [4, 5]
| Outbreak | Year identified | Most affected age group | Emergency area | Deaths | Fatality rate |
|---|---|---|---|---|---|
| Spanish flu Influenza A (H1N1) | 1918–1919 | Young adults, elderly and young children | Unclear | 20–50 million | >2% |
| Asian flu Influenza A (H2N2) | 1957–1958 | Children | Southern China | 1–4 million | 0.1–0.2% |
| Hong Kong flu Influenza A (H3N2) | 1968–1969 | All age groups | Hong Kong | 1–4 million | 0.1–0.2% |
| SARS | 2003 | Middle-aged adults (45-65) | China | 774 | <10% |
| Swine flu Influenza A (H1N1) | 2009 | Children, young adults and pregnant women | Mexico | 18,000 | <0.025% |
| MERS | 2012 | Elderly (60+) | Middle East | 861 | >30% |
| Covid-19 | 2020 | All age groups, especially in elderly and people with diabetes, asthma or heart disease | China | 25,518,343 and continuing (as of update August 25, 2020 | >2% |
| Outbreak | Year identified | Most affected age group | Emergency area | Deaths | Fatality rate |
|---|---|---|---|---|---|
| Spanish flu | 1918–1919 | Young adults, elderly and young children | Unclear | 20–50 million | >2% |
| Asian flu | 1957–1958 | Children | Southern China | 1–4 million | 0.1–0.2% |
| Hong Kong flu | 1968–1969 | All age groups | Hong Kong | 1–4 million | 0.1–0.2% |
| SARS | 2003 | Middle-aged adults (45-65) | China | 774 | <10% |
| Swine flu | 2009 | Children, young adults and pregnant women | Mexico | 18,000 | <0.025% |
| MERS | 2012 | Elderly (60+) | Middle East | 861 | >30% |
| Covid-19 | 2020 | All age groups, especially in elderly and people with diabetes, asthma or heart disease | China | 25,518,343 and continuing (as of update August 25, 2020 | >2% |
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