Master Of Medicine

There are many similarities between measles and pertusis.

Measles

• Caused by paramyxo virus(RNA )
• Only source of infection is a case of measles
• No carriers
• Virus cannot survive outside the body
• Koplik’s spots.
• Rubella is less communicable than measles because of he absence of cough in rubella.
• SAR 90%

Pertusis

• Incubation period 7-14 days, never more than 3 weeks
• Most infectious during catarrhal stage
• Source of infection is a case of pertusis
• No evidence of subclinical infecton or chronic carrier stage.
• SAR is 90% similar to Chickenpox and measles