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That threshold not only prevents infections from ripping through a community, but also protects those who are not able to get vaccinated because they are pregnant, immunocompromised or have other serious health issues.

"Those who are more vulnerable like the severely immunocompromised or those with advanced aged can be at risk of severe illness such as meningitis and life-threatening sepsis."

Of at least 67 confirmed human cases of H5N1 in the U.S., there’s been one fatality in an immunocompromised person who had contact with birds.

If infected, a "small but significant proportion" among the immunocompromised will develop more severe disease where the lungs are affected, with wheezing, breathlessness and symptoms of croup.

Those most at risk from listeria are older people, pregnant women, newborns and those who are immunocompromised.