Sapna Pahil1, Kapil Goyal2, Mini P Singh3. 1. Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh, India. 2. Department of Medical Parasitology, Postgraduate Institute of Medical Education and Research, Chandigarh, India. 3. Department of Virology, Postgraduate Institute of Medical Education and Research, Chandigarh 160 012, India. Electronic address: minipsingh@gmail.com.