Supportive
Suction in infants, hydration.  Neonates with apnea should be admitted to the ICU.
Suction in infants, hydration.  Neonates with apnea should be admitted to the ICU.
Antibiotics do not help with severity or duration but may decrease infectivity.
A reasonable guideline is to treat persons aged >1 year within 3 weeks of cough onset and infants aged <1 year and pregnant women (especially near term) within 6 weeks of cough onset. 
TMP--SMZ should not be administered to pregnant women, nursing mothers, or infants aged <2 months.
The following regemins are for active disease or postexposure prophylaxis.  If a patient is has confirmed disease and is likely to be in contact with infants or pregnant women then the patient should be treated as up to 6-8 weeks after the onset of their illness.
Same antibiotics for active disease and postexposure prophylaxis
Azithromycin 10mg/kg (max 500mg/day) daily x 5 days
Azithromycin 10mg/kg (max 500mg/day) daily x 5 days
if > 6 months old then day 2-5 of treatment should be reduced to 5mg/kg (250mg/day max)
TMP/SMX 4mg/kg PO BID daily for 14 days (if > 2 months old)
if > 6 months old then day 2-5 of treatment should be reduced to 5mg/kg (250mg/day max)
any of the following antibiotics are acceptable although azithromycin is most commonly prescribed
Azithromycin 500mg PO once daily for day #1 then 250mg PO once daily for days #2-5
Clarithromycin 500mg BID x7 days
Erythromycin 500mg QID x7 days
Droplet
Prophylaxis for all household exposures of known<unk> 
High risk people exposed to<unk> : infants, women in 3rd trimester of pregnancy, immunocompromised, severe asthma, people with close contact to infants <1year, people who work in neonatal ICUs / maternity wards.
Patients are considered considerably less infectious 3 weeks after start of paroxysmal phase, or after 5 days of antibiotics
Pertussis
Airway obstruction
Diphtheria
Anaphylaxis
Influenza
Angioedema
Poliomyelitis
Aspirated foreign body