<prompt> 3 year old sister of a neonate is suffering from peussis, which has been documented by isolation and culture of the organism. Most appropriate statement regarding this clinical situation is -If mother received peussis vaccine, the neonate is protectedHyperrimmune globulin is indicated for the neonateErythromycin prophylaxis is indicated in the neonateDPT vaccine is recommended for the elder child  <response>: Those known to have been in contact with whooping cough may be given prophylactic antibioticerythromycin or ampicillin treatment for 10 days to prevent the infecting bacteria to become established. Reference:Park;s textbook of preventive and social medicine,K.Park,23rd edition,page no:164. p 