noun, masculine/pa.sjɑ̃ ze.ʁo/plural: patients zéro
patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)
/pa.sjɑ̃ ze.ʁo/
patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)