Question: What disease was Kyle Broflovski infected with by one of his three friends?

Context paragraphs:
Kenny McCormick: Kenneth "Kenny" McCormick is a main character in the animated adult television series "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Eric Cartman.  His oft-muffled and indiscernible speech—the result of his parka hood covering his mouth—is provided by co-creator Matt Stone.  He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").

Leucostoma canker: Leucostoma canker is a fungal disease that can kill stone fruit ("Prunus" spp.) .  The disease is caused by the plant pathogens "Leucostoma persoonii" and "Leucostoma cinctum" (teleomorph) and "Cytospora leucostoma" and "Cytospora cincta" (anamorphs).  The disease can have a variety of signs and symptoms depending on the part of the tree infected.  One of the most lethal symptoms of the disease are the Leucostoma cankers.  The severity of the Leucostoma cankers is dependent on the part of the plant infected.  The fungus infects through injured, dying or dead tissues of the trees.  Disease management can consist of cultural management practices such as pruning, late season fertilizers or chemical management through measures such as insect control.  Leucostoma canker of stone fruit can cause significant economic losses due to reduced fruit production or disease management practices.  It is one of the most important diseases of stone fruit tree all over the world.

Tonsil Trouble: "Tonsil Trouble" is the first episode in the twelfth season of the American animated television series "South Park", and the 168th episode of the series overall.  Written and directed by series co-creator Trey Parker, it first aired on Comedy Central in the United States on March 12, 2008.  In the episode, Cartman contracts HIV during a blood-transfusion.  When Kyle laughs at Cartman's misfortune, Cartman intentionally infects Kyle with his disease as well.

Cartman Gets an Anal Probe: "Cartman Gets an Anal Probe" is the first episode of the American animated television series "South Park".  It first aired on Comedy Central in the United States on August 13, 1997.  The episode introduces child protagonists Eric Cartman, Kyle Broflovski, Stan Marsh and Kenny McCormick, who attempt to rescue Kyle's younger brother Ike from being abducted by aliens.

Manevri na petiya etazh: Three colleagues and devoted friends – Danton, Petar and Andrey – share an office and not only on the fifth floor of a socialist industrial research institute from the mid-eighties.  Every morning when they come to work they lock the door of the office and, armed with binoculars and great interest, they begin watching the aerobics exercises of a young girl in the nearby building.  Suddenly, their tranquil daily round is disturbed - a new director takes over the Institute and decides to develop close scientific partnerships with similar institutes in Japan.  A rumor has it that one of our three friends will go on a business trip there.  But who?  The three friends are now rivals.  "Homo homini lupus est"!  All the three undertake sophisticated underground maneuvers in order to get the prize.  Everything is at stake!  There is only one rule and it is there are NO rules!  At the end, of course, it turns out everything has been in vain.  The one to go to Japan is the director. <br>Numerous situations filled with humor follow and, at the very end, after the grotesque outcome, we can see the three friends together again.  But this time, much wiser… perhaps.

Stan Marsh: Stanley Randall "Stan" Marsh is the protagonist of the animated television series "South Park".  He is voiced by and loosely based on series co-creator Trey Parker.  Stan is one of the show's four central characters, along with his friends Kyle Broflovski, Kenny McCormick and Eric Cartman.  He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Parker and long-time collaborator Matt Stone in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").

Marek's disease: Marek's disease is a highly contagious viral neoplastic disease in chickens.  It is named after József Marek, a Hungarian veterinarian.  Marek's disease is caused by an alphaherpesvirus known as 'Marek's disease virus' (MDV) or "Gallid herpesvirus 2" (GaHV-2).  The disease is characterized by the presence of T cell lymphoma as well as infiltration of nerves and organs by lymphocytes. Viruses "related" to MDV appear to be benign and can be used as vaccine strains to prevent Marek's disease.  For example, the related Herpesvirus of Turkeys (HVT), causes no apparent disease in turkeys and continues to be used as a vaccine strain for prevention of Marek's disease (see below).  Birds infected with GaHV-2 can be carriers and shedders of the virus for life.  Newborn chicks are protected by maternal antibodies for a few weeks.  After infection, microscopic lesions are present after one to two weeks, and gross lesions are present after three to four weeks.  The virus is spread in dander from feather follicles and transmitted by inhalation.

Kyle Broflovski: Kyle Broflovski (sometimes spelled Kyel Broflovski, Broslovski, Broslofski, Brovlofski or Broflofski) is a main character in the Comedy Central series "South Park".  He is voiced by and loosely based on co-creator Matt Stone.  Kyle is one of the show's four central characters, along with his friends Stan Marsh, Kenny McCormick, and Eric Cartman.  He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").

West Nile virus in the United States: The West Nile virus quickly spread across the United States after the first reported cases in Queens, New York in 1999.  The virus is believed to have entered in an infected bird or mosquito, although there is no clear evidence.  The disease spread quickly through infected birds.  Mosquitoes spread the disease to mammals.  It was mainly noted in horses but also appeared in a number of other species.  The first human cases usually followed within three months of the first appearance of infected birds in the area except where cold weather interrupted the mosquito vectors.

Eric Cartman: Eric Theodore Cartman, often referred to as just Cartman, is a main character in the animated television series "South Park", created by Matt Stone and Trey Parker, and voiced by Trey Parker.  Cartman, generally referred to by his surname, is one of four central characters in "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Kenny McCormick.  Cartman first appeared, originally named Kenny, in prototypical form in a 1992 animated short "Jesus vs. Frosty", and a 1995 animated short "Jesus vs. Santa", and first appeared on television in the pilot episode of "South Park", "Cartman Gets an Anal Probe", on August 13, 1997.

Supporting paragraphs: Tonsil Trouble Kyle Broflovski
Answer: HIV