I don't think Hafiz has a poem named 'Happy virus" but you can refer to http://www.hafizonlove.com/divan/index.htm to find all of Hafiz poems translations. الا یا ایها الـساقی ادر کاسا و ناولـها که عشق آسان نمود اول ولی افتاد مشکل‌ها O beautiful wine-bearer, bring forth the cup and put it to my lips Path of love seemed easy at first, what came was many hardships.

Happy virus means ویروس خوشحال in persian.

ویروس شادی