Paediatrics

Microcephaly : > 3 SD below mean
Macrocephaly : > 2 SD above mean

Newborn Head circumference - 35 cm , By 2year sge - it reaches 48cm (i.e 90% of adult head circumference is achieved in 2yr)

Meningitis
1st 2 months - E.Coli (MC)
2months - 12 years - Pneumococcal and Neisseria.
95% Meningitis in child - affects 1month - 5years age group.

Most common causes :
Sporadic encephalitis - Herpes
Epidemic encephalitis - Arbovirus
Viral encephalitis - Enterovirus (also MC
meningoencephalitis)
Brainstem encephalitis - Rabies
Viral encephalitis : causes
1. Enterovirus (80%)
2. Arbovirus
3. Herpes
4. Mumps