It has been observed that the makeup of gut bacteria in autistic people is different than that of neurotypical individuals which has raised the question of influence of gut bacteria on ASD development via inducing an inflammatory state. Listed below are some research findings on the influence of gut bacteria and abnormal immune responses on brain development:
Some studies on rodents have shown gut bacteria influencing emotional functions and neurotransmitter balance in the brain, both of which are impacted in ASD. The immune system is thought to be the intermediary that modulates the influence of gut bacteria on the brain. Some ASD individuals have a dysfunctional immune system with higher numbers of some types of immune cells, biochemical messengers and modulators, and autoimmune antibodies. Increased inflammatory biomarkers correlate with increased severity of ASD symptoms and there is some evidence to support a state of chronic brain inflammation in ASD. More pronounced inflammatory responses to bacteria were found in ASD individuals with an abnormal gut microbiota. Additionally, immunoglobulin A antibodies that are central to gut immunity were also found in elevated levels in ASD populations. Some of these antibodies may attack proteins that support myelination of the brain, a process that is important for robust transmission of neural signal in many nerves. Activation of the maternal immune system during pregnancy (by gut bacteria, bacterial toxins, an infection, or non-infectious causes) and gut bacteria in the mother that induce increased levels of Th17, a pro-inflammatory immune cell, have been associated with an increased risk of autism.
Josefina Guerrero was a Filipino spy during World War II, who used the Japanese fear of her leprosy to listen to their battle plans and deliver the information to the American forces under Douglas MacArthur. King Henry IV of England (reigned 1399 to 1413) possibly had leprosy. Vietnamese poet Hàn Mặc Tử
Ōtani Yoshitsugu, a Japanese daimyō

Leprosy in the media
English author Graham Greenes novel A Burnt-Out Case is set in a leper colony in Belgian Congo. The story is also predominantly about a disillusioned architect working with a doctor on devising new cure and amenities for mutilated victims of lepers; the title, too, refers to the condition of mutilation and disfigurement in the disease. Forugh Farrokhzad made a 22-minute documentary about a leprosy colony in Iran in 1962 titled The House Is Black. The film humanizes the people affected and opens by saying that "there is no shortage of ugliness in the world, but by closing our eyes on ugliness, we will intensify it." Molokai is a novel by Alan Brennert about a leper colony in Hawaii. This novel follows the story of a seven year old girl taken from her family and put on the small Hawaiian island of Molokais leper settlement. Even though this is a fiction novel it is based upon some very true and revealing incidents which occurred at this Leprosy settlement. The lead character in The Chronicles of Thomas Covenant by Stephen R. Donaldson suffers from leprosy.