STIs may be caused by several different types of pathogens, including protozoa, insects, bacteria, and viruses.For example: Protozoa cause an STI called trichomoniasis.
HPV is a different virus than HIV and HSV (herpes). HPV is so common that nearly all sexually active men and women get it at some point in their lives. There are many different types of HPV. Some types can cause health problems including genital warts and cancers.  Syphilis is a bacterial STI that is caused by the bacteria Treponema pallidum. It is generally a very rare STI, but it can cause serious and permanent damage to the body if it is not cured. In some rare cases, particularly where treatment is not available, syphilis infection can cause death. Syphilis can be cured with antibiotics. Remember, a person can reacquire syphilis infection, so their partner(s) should also be tested. Impact if not treated. Untreated Syphilis can cause potentially life-threatening complications, and permanent damage to the brain, heart, bones, and blood vessels. A virus. However, very few outbreaks or sores thought to be caused by the herpes virus actually test positive for the herpes virus. If a sore or outbreak does not test positive in a culture test or swab test it is impossible to diagnose the OB as viral. Genital Herpes. Genital herpes is a contagious infection caused by the herpes simplex virus (HSV). There are two different strains, or types, of HSV: herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2). Both can cause genital herpes, although most cases of genital herpes are caused by HSV-2. Here are descriptions of some of the most common and well known: Chlamydia Gonorrhea Genital Herpes HIV/AIDS Human Papillomavirus (HPV) Syphilis Bacterial Vaginosis Trichomoniasis Viral Hepatitis Chlamydia Chlamydia1 (pronounced kla-MID-ee-uh) is a common STD/STI caused by the bacterium Chlamydia trachomatis. Some animals and plants suffer from diseases which are also called Measles but which are caused by entirely different pathogens (such as parastical worms). The pathogen that causes Measles is the Measles virus, a type of  paramyxovirus. Here's a brief description of it:  http://en.wikipedia.org/wiki/Measles_virus. In most cases  where a pathogen is connected with a cancer, the pathogen may not  be causing the cancer, but may be diverting or inhibiting the  natural defenses of the body that are able to intercept and  neutralize damaged cells which could lead to cancer. Genital Herpes is a virus, but outbreaks may be fungus. No herpes is a virus. Genital herpes is a sexually transmitted disease (STD) caused by the herpes simplex viruses type 1 (HSV-1) or type 2 (HSV-2). Most genital herpes is caused by HSV-2. Most individuals have no or only minimal signs or symptoms from HSV-1 or HSV-2 infection. However, very few outbreaks or sores thought to be caused by the herpes virus actually test positive for the herpes virus. If a sore or outbreak does not test positive in a culture test or swab test it is impossible to diagnose the OB as viral. What is a Pathogen, Different Types of Pathogens. Technically, a pathogen is anything that can cause a disease, literally means disease producer. However, it’s common use is in reference to different types of infectious germs, like bacteria, viruses, fungi and parasites. Pathogens are highly abundant, for they can just about live anywhere. Some thrive in heat, while others prefer the cold. Some types need oxygen or a host, while others do not. Pathogens that cause infectious diseases are often grouped into different types. Route of transmission is one way a pathogen is typed. These are some of various means and a sampling of the different types of related pathogens or diseases: 1  another person ~ STDs HPV is the most common STD/STI. More than 40 HPV types exist, and all of them can infect both men and women. The types of HPVs vary in their ability to cause genital warts; infect other regions of the body, including the mouth and throat; and cause cancers of the cervix, vulva, penis, and mouth. Here are descriptions of some of the most common and well known: Chlamydia Gonorrhea Genital Herpes HIV/AIDS Human Papillomavirus (HPV) Syphilis Bacterial Vaginosis Trichomoniasis Viral Hepatitis Chlamydia Chlamydia1 (pronounced kla-MID-ee-uh) is a common STD/STI caused by the bacterium Chlamydia trachomatis. Bacterial STIs-STDs. Bacterial STIs are caused by bacteria passed from person-to-person during sexual activity. There are three infections in this category: Chlamydia, Gonorrhea, and Syphilis. Syphilis can be cured with antibiotics. Remember, a person can reacquire syphilis infection, so their partner(s) should also be tested. Impact if not treated. Untreated Syphilis can cause potentially life-threatening complications, and permanent damage to the brain, heart, bones, and blood vessels. Some infections that can spread through sexual contact, such as the common cold, spread more commonly by other means. These infections are not considered STIs. Pathogens that Cause STIs. STIs may be caused by several different types of pathogens, including protozoa, insects, bacteria, and viruses. For example: Protozoa cause an STI called trichomoniasis. The pathogen infects the vagina in females and the urethra in males, causing symptoms such as burning and itching. 1 Infection with HPV. 2  can be prevented with a vaccine. 3  can cause hepatitis B. 4  is very common in young men. 5  all of the above. 6  Syphilis. 7  can cause serious damage to the heart, brain, and other organs. 8  causes small sores on or near the genitals. 9  if untreated, may eventually lead to death.
http://www.cdc.gov/STD/HPV/STDFact-HPV.htm http://sexualityandu.ca/stis-stds/types-of-stis-stds/bacterial-stis-stds http://www.answers.com/Q/What_type_of_pathogen_causes_genital_herpes https://www.nichd.nih.gov/health/topics/stds/conditioninfo/Pages/types.aspx http://www.answers.com/Q/What_pathogen_causes_STDs http://www.answers.com/Q/What_type_of_pathogen_causes_genital_herpes http://www.healthblurbs.com/what-is-a-pathogen-different-types-of-pathogens/ https://www.nichd.nih.gov/health/topics/stds/conditioninfo/Pages/types.aspx http://sexualityandu.ca/stis-stds/types-of-stis-stds/bacterial-stis-stds http://www.ck12.org/workbook/CK-12-Biology-Workbook/section/25.4/
what type of pathogen can cause an sti