The human <e1>papillomavirus</e1> is one of the most common causes of these and most other types of <e2>warts</e2>, and this is a virus that attacks the skin through direct contact.
The human papillomavirus is
The human papillomavirus is one of the most common causes of these and most other types of warts, and this is a virus that attacks the skin through direct contact.
<triplet> papillomavirus <subject> warts <object> Cause-Effect(e1,e2)