Fjöldónæmi
Fjöldónæmi, also known as herd immunity or community immunity, is a concept in epidemiology where a sufficiently large proportion of a population is immune to a specific infectious disease, thereby protecting individuals who are not immune. This protection arises because the spread of the disease is significantly hampered or stopped altogether. When most individuals are immune, the chances of an infected person encountering a susceptible person are drastically reduced, breaking the chain of transmission.
The level of immunity required to achieve fjöldónæmi, known as the herd immunity threshold, varies depending
Fjöldónæmi is crucial for protecting vulnerable populations who cannot be vaccinated or for whom vaccines are