This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
The single most common cause of Neonatal meningitis is 
Select and explain. 
A. Group B streptococcus, B. Haemophilus, C. Meningococcus, D. Mycobacterium
A: Group B streptococcus
Answer: A: Group B streptococcus 
Explanation: (A) Group B streptococcus # Group-B streptococcus has assumed great clinical importance as the single most common cause of neonatal meningitis in the West.> Infection in the new born is classified as the early onset type occurring within a week of birth & the late onset type developing between the 2nd and 12th weeks of life.> More common early onset type presents as septicemia meningitis or pneumonia, and is often fatal> Infection is acquired from the maternal vagina during birth> In the late onset type, infection is more often obtained from the environment.