Final answer:
Verruca vulgaris, also known as common warts, is caused by the HPV-2 strain, which is a low-risk type not associated with cancer.
Step-by-step explanation:
Verruca vulgaris, commonly known as common warts, are caused by various strains of the human papillomavirus (HPV). After reviewing the different types of HPV and their associated diseases, it is evident that HPV-2 is one of the strains known to cause verruca vulgaris. This is a low-risk strain in relation to cancer potential. Nonetheless, HPV has many strains, over 200 in fact; some are considered high-risk due to their association with cancers, such as HPV-16 and HPV-18, which are linked to the majority of cervical cancer cases. High-risk HPV strains can also lead to other cancers such as penile and oropharyngeal cancer. Low-risk HPV types, like HPV-2, can cause skin warts but are not associated with cancer. HPV infections can often be cleared by the immune system within a couple of years.