Conjunctival culture swabs will be transported to the microbiology laboratory using the BBLTM CultureSwabTM (Becton, Dickinson and Company, Sparks, MD 21152) transport system and then inoculated onto blood agar plates and incubated at 37°C for 3 days. All blood agar plates will be incubated in a microaerophilic environment. Blood agar cultures will be deemed positive if 1 or more colony forming units are observed. Nasopharyngeal swabs will be directly inoculated on blood agar plates and transported to the microbiology laboratory and processed as above.