Erythema infectiosum(5th disease) ParvoB19 virus

Question 1

season

Answer 1

late winter early spring

Question 2

incubation period

Answer 2

4-14 days( average 7 days)

Question 3

prodome

Answer 3

mild headache runny nose and low grade fever may precede rash by 1-2 days.

Question 4

3 phases

Answer 4

PHASE 1- begins abruptly w an asymptomatic erythema of the cheeks. referred as “slapped cheek” - diffuse and macular but tiny translucent papules may be present. most intense beneath the eyes and may extend ober the cheeks in a butterfly wing pattern.

perioral area lids and chin are usually inaffected.

after 1-4 days, SECOND PHASE- Discrete erytjematous macules and papules on the proximal extremities and later trunk. evolved into a RETICULATE OR LACY PATTERN.
last 5-9 days.

Third phase: RECURRING STAGE. The eruption is greatly reduced or invincible only to recur agterthe px is exposed to heat. or sunlight. in response to crying or exercise.

80% of adults- joint inv.