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Spanish flu and smallpox are examples of past viruses. Spanish flu is an influenza

virus that occurred in 1918, caused more than 50 million deaths. It's widely known

that it might be caused by the migration of the flu virus from birds to pigs. Spanish

media have dealt with the Spanish flu in depth hence even though Spain wasn’t

the place for the outbreak, it is named as Spanish flu. The Spanish flu is largely

divided into the first wave of the spring of 1918 and the second wave of the fall

and winter. At the time of the second wave, the Spanish flu, which became more

toxic, appeared. The Spanish flu killed one fifth of the world’s population, more

than 50 million people, compared with about 15 million in World War I. The First

World War was hastily concluded, and a peace treaty was signed. This taught us

the need for transparency as well as the effectiveness of quarantines, leading us to

the start of the flu vaccination culture. The symptom is a disease that develops into

pneumonia after showing symptoms that appear to have a cold, and then turns

black as oxygen escapes from the patient's skin. The Spanish flu virus is influenza

A, the same type of flu that broke out in 2006. Like this, viruses can evolve and

recur. Vaccines for the Spanish flu include Green Flu-S and Pandemrix. Green Flu-

S is Korea's first self-developed and produced vaccine against swine flu. Pandemrix

is a vaccine developed to prevent influenza such as H1N1 and consists of active

antigen extracted from H1N1 as well as antigen-enhancing agent AS03.

Smallpox is a serious viral infection caused by the Variola virus. It is not yet known

when smallpox began, but the discovery in the mummy of Egyptian Pharaoh

Ramesses V is believed to be the oldest physical evidence of smallpox. Smallpox

killed 400,000 people a year before the 18th century in Europe alone, and 80

percent of children died if infected. Two million people died during the year.

Vaccination between the 19th and 20th centuries greatly reduced the number of

smallpox infections, and the WHO declared the eradication of smallpox in

1979.Smallpox is the first infectious disease that has been eradicated by humans.

The initial symptoms are fever, muscle pain, anxiety, headache, exhaustion, etc.

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