What causes a viral infection?

Patient's question:

About a week ago, I just had a daughter and stayed in the hospital for 4 days before coming home. Today is the fifth day since coming home, and my wife has been feeling very tired, with a headache, nausea, dry heaving, accompanied by fever, which reached over 38 degrees Celsius. She also has some frequent urination. She hasn't eaten anything dirty, and she hasn't had a fever. After a thorough examination at the hospital, the doctor said she had postpartum infection.
What kind of assistance is needed: What are the sources of bacteria that cause postpartum infection?

Doctor's answer:

1. External transmission: Infection caused by contact with patients through industrial-polluted clothing, utensils, various surgical instruments, and items.
2. Self-transmission: Infection resulting from pathogens in the reproductive tract of pregnant women that feed on blood. This can not only lead to postpartum infection but also indirectly transmit to the fetus through the placenta, fetal membranes, or amniotic fluid, causing miscarriage, premature birth, stillbirth, fetal developmental abnormalities, or premature rupture of membranes. Self-transmission is a significant factor in the occurrence of postpartum infection, especially when only vaginitis or cervicitis is present during pregnancy, but it leads to postpartum infection afterward.

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