1. Department of Microbiology and Molecular Biology, Aravind Eye Hospital and Postgraduate Institute of Ophthalmology, Tirunelveli, Tamil Nadu 627 001, India
2. Aravind Eye Hospital and Postgraduate Institute of Ophthalmology, Tirunelveli, Tamil Nadu 627 001, India
3. Department of Cornea and External Eye Diseases, Aravind Eye Hospital and Postgraduate Institute of Ophthalmology, Tirunelveli, Tamil Nadu 627 001, India
4. Postgraduate Department of Microbiology, Sri Paramakalyani College, Alwarkuruchi, Tirunelveli, Tamil Nadu 627412, India