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Contagious Period



Condition/Disease
Incubation Period
(in Days)

Contagious Period
(in Days)
Skin Infections/Rashes

Chicken Pox
10-21
2 days before rash appears, until all sores have crusts (6-7 days)
Fifth Disease
4-14
7 days before rash begins
Hand-foot-and-mouth
3-6
Onset of mouth ulcers until fever is gone
Impetigo
2-5
Onset of sores until 24 hours on an antibiotic
Lice
7
Onset of itch until one treatment of anti-lice shampoo
Measles
8-12
4 days before rash appears until 4 days after rash appears
Roseola
9-10
Onset of fever until the rash is gone (generally 2 days)
Rubella
(German measles)
14-21
7 days before rash appears until 5 days after rash appears
Scabies
30-45
Onset of rash until one treatment
Scarlet Fever
3-6
Onset of fever or rash until 24 hours on an antibiotic
Shingles
14-16
Onset of rash until all sores have crusts (7 days)
Warts
30-180
Staying home is not necessary; minimally contagious
Respiratory Infections

Bronchiolitis
4-6
Onset of cough until 7 days
Colds
2-5
Onset of runny nose until fever is gone
Cough/Croup (viral)
2-5
Onset of cough until fever is gone
Diphtheria
2-5
Onset of sore throat until 4 days on antibiotic
Influenza ("flu")
1-2
Onset of symptoms until fever is gone
Sore throat, strep
2-5
Onset of sore throat until 24 hours on an antibiotic
Sore throat, viral
2-5
Onset of sore throat until fever is gone
Tuberculosis
6-24 months
Until 2 weeks on drug therapy. Most childhood TB is not contagious
Whooping cough
7-10
Onset of runny nose until 5 days on an antibiotic
Intestinal Infections

Diarrhea, bacterial
1-5
Contagious until stools are formed.  Stay home until fever is gone, diarrhea is mild, blood and mucus are gone, and potty-trained child has control over loose bowel movements
Diarrhea, Giardia
7-28
Same as above
Diarrhea, traveler's
1-6
Same as above
Diarrhea, viral (Rotavirus)
1-3
Same as above
Hepatitis A
14-50
Two weeks before jaundice begins until 1 week after jaundice begins
Pinworms
21-28
Staying home is not necessary; infection is very mild and/or minimally contagious
Vomiting, viral
2-5
Until vomiting stops
Other Infections

Mono
30-50
Onset of fever until the fever is gone
Meningitis, bacterial
2-10
7 days before symptoms appear until 24 hours on IV antibiotics in the hospital
Mumps
15-25
5 days before swelling appears until the swelling is gone
Pinkeye without pus
1-5
Staying home is not necessary; infection is very mild and/or minimally contagious
Pinkeye with pus
2-7
Onset of pus (matted eyes) until 1 day on antibiotic eyedrops


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