Use a comma to separate nonessential elements from a sentence. More specifically, when a sentence includes information that is not crucial to the message or intent of the sentence, enclose it in or separate it by commas.
Genital warts are a sexually transmitted infection (STI) caused by certain strains of the human papillomavirus (HPV). These skin growths can cause pain, discomfort, and itching. They are especially dangerous for women because some types of HPV can also cause cancer of the cervix and vulva.
This particular subgroup of L. brevis strains cause severe hazes, sediments, and ropiness in beer. In a few cases, another subgroup of L. brevis strains, previously known as L. diastaticus, utilize dextrin, causing the superattenuation of worts during fermentation ( Briggs, Boulton, Brookes, & Stevens, 2004).