Bacteria, viruses, and parasites can cause a wide variety of illnesses, and can infect any of the organs of the body. Viruses are often responsible for respiratory illnesses (such as the common cold) and digestive illnesses (such as diarrhea).
Disability will not pay for any more time off work than that for pregnancy. After that, many employers let you stay off for the full 3 months for maternity leave but the disability cuts off after 6 or 8 weeks, depending on how you delivered. That's not just how Aflac does it, that's how all disability works.
Term pregnancy is 37 to 41 weeks, with early term being 37 and 38 weeks, full term 39 and 40 weeks, and late term 41 weeks. After 41 weeks, it is known as post term. Babies born before 37 weeks are preterm and are at higher risk of health problems such as cerebral palsy.