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 -

<p> Those known to have been in contact with whooping cough may be given prophylactic antibiotic(erythromycin 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>