Incubation period for parvovirus B19 causing erythema infectiosum is which of the following?

• A. 4-14 days
• B. 1-2 days
• C. 3-7 weeks
• D. 6-8 weeks

Answer: (A)

Parvovirus B19 infection (erythema infectiosum) has a short to moderate incubation period, meaning the time from exposure to the first signs or symptoms. For this virus, that interval is typically about 4 to 14 days. This fits the pattern of many viral illnesses where a mild prodrome—such as low‑grade fever or malaise—occurs, followed by the distinctive facial rash. The other timeframes are not consistent with how this virus behaves: 1-2 days is too quick for viral replication and symptom development, while weeks-long periods (3-7 or 6-8 weeks) are far longer than what’s typically seen with parvovirus B19.