Ahmad, Tahir, Yasir Waheed, Sadia Tahir, Sher Zaman Safi, Kaneez Fatima, Muhammad Sohail Afzal, Zia-ur-Rehman Farooqi, and Ishtiaq Qadri. 2010. “Frequency of HEV Contamination in Sewerage Waters in Pakistan”. The Journal of Infection in Developing Countries 4 (12):842-45. https://doi.org/10.3855/jidc.612.