Infectious Diseases Manifesting With Rash

Question 1

Scarlet fever

Answer 1

Group A beta haemolytic strep

Question 2

Treatment of scralet fever

Answer 2

10 days

Phenoxymetylpenicillin first choice

Amoxicillin cephalosporins
Macrolides in case of allergy for beta lactams

Clindamycin

Question 3

Measles etiology

Answer 3

RNA virus family Paramyxoviridae

Question 4

Facts about measles

Answer 4

Very contagious: 90% of susceptible contacts acquire the disease

Maximal dessemination of virus is by droplet spray (catarrhal stage)

An infected person is contagious from 9-10th day after exposure until 5 days after rash appearance

Question 5

Rubella etiology

Answer 5

An RNA virus from Togaviridae

Question 6

Facts about rubella

Answer 6

Humans are the only natural host
Spread by droplets of placenta
Maternal antibodies are protective for the first.6 months of life

Usually occur in spring

Contagious 7 days before and 5 days after rash

Incubation: 14-21days

Question 7

Complication of rubella

Answer 7

Polyarthritis

Thrombocytopenia
Encephalitis

Question 8

Exanthem subitum (roseola infantum) etiology

Answer 8

Human herpes virus 6 most cases

HH7 some cases

Question 9

Complications of exanthem subitum

Answer 9

Fever seizures in 10-15% of children
Meningoencephalitis
Thrombocytopenia
Hepatitis

Question 10

Erythema infectiosum etiology

Answer 10

Parvovirus B19

Question 11

Incubation period of erythema infectiosum

Answer 11

4-28 days

Question 12

Complications of erythema inf

Answer 12

Arthralgia or arthritis in ado and adults
Thrombocytopenia purpura
Aseptic meningitis

Question 13

Impetigo treatment:

Answer 13

Mupirocin
Fusidic acid

And systemic if it is close to natural openings