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An unidentified flying object (UFO) is any aerial phenomenon that cannot immediately be identified or explained. Most UFOs are identified on investigation as conventional objects or phenomena. The term is widely used for claimed observations of extraterrestrial spacecraft.

Explanation:

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Explanation:

1. Self quarantine ensures that those with the virus do not spread it to other people. A person with the virus spread the disease by shaking hands, sneezing or talking around other people who are very close to them. Avoiding public places reduces the spread.

2. It ensures that uninfected people are protected from contracting the viral disease which is spread airborne (aerosols from an infected person). Keeping a distance of more than 3 meters between persons reduces the risks of catching the diseases from an infected person.

3. Self-quarantine also helps the government to contain the disease by enabling them to monitor the spread, locate contacts of persons who have been positively diagnosed, and disinfect public spaces. China has used vehicle-mounted pumps to spray waiting for bays - for public transport - using chlorine.