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Internal migrations from part of a country to another are the most common form of permanent migration.
Common Cold
A widely prevalent, contagious viral infection of the upper respiratory tract, resulting in symptoms like sneezing, coughing, sore throat, and runny nose.
Innate Immune System
The non-specific first line of defense against pathogens, consisting of physical barriers, immune cells, and proteins.
Specific Immune System
Refers to the part of the immune system that provides long-term immunity against pathogens, by recognizing and remembering specific antigens.
Acquired Immune System
The part of the immune system that develops antibodies in response to exposure to pathogens, as opposed to innate immunity which individuals are born with.
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