Sexually transmitted diseases (STDs)

• STDs are among the most common infectious diseases in the world today.
  There are over 20 types, affecting more than 13 million men and women in the United States alone each year, and the incidence is on the rise.
  
  Some of the most common STDs include chlamydial infection, genital herpes, genital warts, gonorrhea, HIV (human immunodeficiency virus, the microorganism that causes AIDS), and syphilis.
  
  General Signs and Symptoms
  STDs often occur without symptoms, particularly in women. However, STDs may be accompanied by the following signs and symptoms:
  Itching
  Discharge
  Pustules (pus-containing blisters)
  Genital lesions including ulcers, blisters, rashes, and warts; ulcers may be painful
  Abdominal pain
  Rectal infection and inflammation of the rectum
  Fever
  Muscle pain
  Painful urination
  Swollen lymph glands in the groin
  What Causes It?
  STDs are caused by microbial agents and spread primarily (but not exclusively) through sexual contact. Some STDs can also be passed from a mother to her baby during delivery and through breastfeeding while infected. Others may be passed by sharing infected needles.
  
  Some of the most common STDs and the microorganisms that cause them are listed below.
  
  Chlamydial infection—Chlamydia trachomatis
  Genital herpes—herpes simplex virus (HSV)
  Genital warts—human papillomavirus (HPV)
  Gonorrhea—Neisseria gonorrhoeae
  
  Who's Most At Risk?
  
• People with the following conditions or characteristics are at risk for developing STDs.
  Having a sexual partner with an STD; again, in many cases, an STD may be present without symptoms
  Having many sexual partners, or a partner who has many sexual partners
  Having sex without the use of condoms or other protective devices
  Having one STD increases the likelihood of contracting another
  Adolescents are at highest risk for acquiring an STD for the first time
  Living under stress from poverty, poor nutrition, or poor or absent healthcare
  Practicing anal intercourse increases risk for HIV, gonorrhea, and syphilis
  Having a weakened immune system
  Using intravenous drugs
  
  Using spermicidal foams and jellies does not protect against STDs and may, in some cases, even promote contraction of certain STDs, including HIV