Coccobacilli are rod shaped bacteria, but they are short and fat, so that they look like a cross between rods (bacilli) and spheres (cocci). There are many types of coccobacilli including Haemophilus influenzae, Chlamydia trachomatis, Acinetobacter species, Pasteurella multocida, and a number of others. They are usually opportunistic pathogens, causing no problem until the other flora of the region are disturbed. All of them respond to antibiotic treatment.
The term coccobacilli is non-specific. It's like the term "furniture." Furniture can be chairs, tables, sofas, and beds. Coccobacilli can be Chlamydia trachomatis which is an STD and is only sexually transmitted.
It can also be H. influenzae or one of the others, which are not STDs. The others can be found when there is bacterial vaginosis, which is a vaginal infection that occurs when the normal vaginal flora (bacteria and yeasts) are disturbed. The coccobacilli then grow out of bounds. Things that can disturb vaginal bacteria are douching, bubble baths, taking antibiotics, stress, and sometimes no reason is found. If the coccobacilli found was Chlamydia, it should have said so.