Incubation Period
Incubation period.  This does not relate to chickens hatching.  People should be aware of the period
where you can catch or pass-on a particular illnesses.  The following information can be useful to
help protect you or your special needs child should there be notice that particular illnesses are
around.
            Common Illness Incubation Period

      Incubation
Disease             Period (days)    Contagious Period
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SKIN INFECTIONS
Chickenpox                10 to 21    5 days before rash
                           until all sores have
                           crusts (5-7 days)

Fifth disease              4 to 14    7 days before rash
(Erythema infectiosum)              until rash begins

Hand, foot, and mouth      3 to 6     Onset of mouth ulcers
disease                             until fever is gone

Impetigo (strep or staph)  2 to 5     Onset of sores until
                           24 hours on antibiotic

Lice                       7          Onset of itch until
                           one treatment

Measles                    8 to 12    4 days before until 5
                           days after rash appears

Roseola                    9 to 10    Onset of fever until
                           rash is gone (2 days)

Rubella (German measles)  14 to 21    7 days before until
                           5 days after rash appears

Scabies                   30 to 45    Onset of rash until
                           one treatment

Scarlet fever              3 to 6     Onset of fever or rash
                           until 24 hours on
                           antibiotic

Shingles (contagious      14 to 16    Onset of rash until
for chickenpox)                     all sores have crusts
                           (7 days) (Note: No
                           need to isolate if
                           sores can be kept
                           covered.)

Warts                     30 to 180   See footnote A
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RESPIRATORY INFECTIONS

Bronchiolitis              4 to 6     Onset of cough until
                           7 days

Colds                      2 to 5     Onset of runny nose
                           until fever is gone

Cold sores (herpes)        2 to 12    See footnote B

Coughs (viral)             2 to 5     Onset of cough until
                           fever is gone

Croup (viral)              2 to 6     Onset of cough until
                           fever is gone

Diphtheria                 2 to 5     Onset of sore throat
                           until 4 days on
                           antibiotic

Influenza                  1 to 2     Onset of symptoms
until
                           fever is gone

Sore throat, strep         2 to 5     Onset of sore throat
                           until 24 hours on
                           antibiotic

Sore throat, viral         2 to 5     Onset of sore throat
                           until fever is gone

Tuberculosis               6 to 24    Until 2 weeks on
                 months    drugs (Note: Most
                           childhood TB is not
                           contagious.)

Whooping cough             7 to 10    Onset of runny nose
                           until 5 days on
                           antibiotic

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INTESTINAL INFECTIONS
Diarrhea, bacterial         1 to 5    See footnote C

Diarrhea, Giardia           7 to 28   See footnote C

Diarrhea, traveler's        1 to 6    See footnote C

Diarrhea, viral (Rotavirus) 1 to 3    See footnote C

Hepatitis A                14 to 50   2 weeks before until
                           1 week after jaundice
                           begins

Pinworms                   21 to 28   See footnote A

Vomiting, viral             2 to 5    Until vomiting stops

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OTHER INFECTIONS
Infectious mononucleosis  30 to 50    Onset of fever until
                           fever is gone (7 days)

Meningitis, bacterial      2 to 10    7 days before symptoms
                           until 24 hours on IV
                           antibiotics in
                           hospital

Mumps                     12 to 25    5 days before swelling
                           until swelling gone
                           (7 days)

Pinkeye without pus        1 to 5     See footnote A
(viral)

Pinkeye with pus           2 to 7     Onset of pus until
(bacterial)                         1 day on antibiotic
                           eye drops
(A) Staying home is unnecessary because the infection is very mild and/or minimally contagious.

(B) Cold sores

* Under age 6 years: Your child should stay home until the sores are dry (4 to 5 days). However, if the sores are
on a part of the body that can be covered, your child does not need to stay home.
* Over age 6 years: Your child does not need to stay home if he is beyond the touching, picking stage.

(C) Diarrhea

* Not toilet trained: Your child should stay home until stools are formed.
* Toilet trained: Your child should stay home until the fever is gone, diarrhea is mild, blood and mucus are gone,     
         and your child has control over loose bowel movements.
* Talk to your child care provider about attendance restrictions.