Due to the high rate of mutation of viuses, hundreds of subcatagories of flu types are in the air. New vaccines are created every year to combat the most common strains for the new season. Melvin Sanicas explains flu vaccines and why they people need a new flu shot every year.
What is Corona Virus? How do viruses spread? This animation explains the COVID virus came about and was able to spread from host to host and create a global pandemic.