infectivity of some common infections
Periods of infectivity for some common infections are listed.
- Mumps: 3 days before salivary gland swelling to 7 days after.
- Chicken pox: a few days before the onset of rash develops and not more than six days after first lesions appear (1).
- Measles: from the appearance of prodromal symptoms to 4 days after the onset of the rash.
- Rubella: one week before onset of rash until 4 days after.
- Whooping cough: one week after exposure until 3 weeks after onset of symptoms (but only 7 days if antibiotics given).
- Scarlet fever: 10-21 days after the rash onset (but only five days if penicillin given) (2).
- Slapped cheek disease: for up to 14 days before the onset of the rash. A child is no longer infectious once the rash has appeared.
- (1) Institute for Child Health, Great Ormond Street Hospital for Children NHS Trust.
- (2) Health Protection Agency (Accessed 20/12/07): Scarlet Fever
Last edited 12/2021 and last reviewed 01/2022