Значения термина immunologically naive на английском

The absence of prior infections may put an immunologically naive population at risk for disease outbreaks.

The virus that causes the disease, Sars-CoV-2, is a new pathogen in humans, meaning we are all immunologically naive to it.

Humans are immunologically naive to these subtypes, and an H7N9 strain that acquires the capability of efficient human-to-human transmission poses a credible pandemic threat.