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.
In other words, if you qualify for OFLA, you can use 6-8 weeks of pregnancy disability leave, followed by 12 weeks of parental leave. Parental leave can be used for the adoption of a child or to take care of a child who becomes incapacitated so it is more broadly applicable than just to the birth of a child.