Virus Appreciation Day
Virus Appreciation Day is held on October 3. This event in the first decade of the month October is annual. 
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The holiday known as Virus Appreciation Day, celebrated on Oct. 3, is a day of appreciating what at the time seemed like a hinderance. The Cowpox virus that inspired the holiday saved millions of lives, despite it causing a disease itself. The Cowpox was very similar to Smallpox, a disease caused by the Variola virus.
Nobody seems to know why this is Virus Appreciation Day, or whose idea is it, or whether they meant computer viruses or the biological cell-invading kind. But hey, it's a holiday, so we will celebrate, well, not viruses, but the success we've had so far in fighting them.
Similar holidays and events, festivals and interesting facts
World No Alcohol Day on October 2
Worldwide Day of Play on October 2 (is an annual event designed to encourage children and parents to turn off the television and play together, especially outdoors);
Medical Technologist's Day in Chile on October 2
World Farm Animals Day on October 2
World Multiplication Table Day on October 2 (Held on the first Friday in October);
International Frugal Fun Day on October 3 (first Saturday in October);
Techie's Day on October 3
World Card Making Day on October 3 (the first Saturday in October);
Mushroom Day on October 3 (unofficial mushroom picker holiday - silent hunt);
Mean Girls Day on October 3
Fullmetal Alchemist Day on October 3 (celebrated by manga and anime lovers);
World Walking Day on October 4
Improve Your Office Day on October 4
Change A Light Day on October 4 (First Sunday of October);
Autumn festival with children's suitcase flea market, Freiberg on October 4
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