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Chlamydia is a common STD among both men and women. It can damage a woman’s reproductive system, making it difficult or impossible to get pregnant. Chlamydia can also cause a pregnancy to occur outside the womb or the infection to pass to your baby during delivery, causing an eye infection or pneumonia in your newborn. You should receive testing for chlamydia at your first prenatal visit. A positive result of Chlamydia trachomatis IgG indicates past, current, or chronic infection, while positive IgM antibodies indicate recent infection.

Mycoplasma pneumoniae bacteria commonly cause mild respiratory infections. Sometimes these bacteria can cause more serious lung infections requiring hospital care. Detection of specific IgM antibodies is evidence of a current or recent infection. A demonstration of specific IgG to the bacteria is evidence of past infection.

Syphilis is a sexually transmitted infection (STI) that causes serious health problems without treatment and is transmissible from a mother to her unborn baby. Infection develops in stages (primary, secondary, latent, and tertiary), with each stage having different signs and symptoms. This test detects the antibodies produced during syphilis infection.