Disease Causative Agents

Neisseria species are gram-negative bacteria included among the proteobacteria.

HHV-6 causes a self-limiting erythematous infection.

Patients with cold hemagglutinin disease have monoclonal anti-blood group I.

Brucella are pathogens of animals that spread to humans through direct contact.

The membrane attack complex containing C8 and C9 is important for destroying the Neisseria bacterium.

Kernig's sign is observed in Aseptic meningitis. Kernig's sign is  positive when the thigh is bent at the hip and knee at 90 degree angles, and subsequent extension in the knee is painful. Aseptic meningitis, or sterile meningitis, is a condition in which the layers lining the brain, meninges, become inflamed caused by Herpes simplex virus 2.

Herpes simplex virus type 2 is associated with Aseptic meningitis. It is an inflammation of the meninges (the membranes covering the brain and spinal cord) caused by viral infection.

Hepatitis A is transmitted by faecal-oral route and hence, causes acute hepatitis.

Hantaan river virus is the causative agent of Korean hemorrhagic fever in humans. Initial symptoms begin suddenly and include intense headaches, back and abdominal pain, fever, chills, nausea and blurred vision. Individuals may have flushing of the face, inflammation or redness of the eyes or a rash. Later symptoms can include low blood pressure, acute shock, vascular leakage and acute kidney failure, which can cause severe fluid overload.

Human parainfluenza virus type 3 (HPIV-3) is associated with bronchiolitis and pneumonia.

Coronavirus is the only enveloped causative agent of gastroenteritis.

Reye's syndrome is a rapidly progressive encephalopathy, which usually begins shortly after recovery from an acute infection of influenza virus.

Parvovirus B19 causes a childhood rash disease called fifth disease or erythema infectiosum, or slapped cheek syndrome. Symptoms are bright red rash of the cheeks, fever, diarrhea, nausea, exacerbation of rash by the sunlight, heat and stress.

This is the correct match. Colt virus causes Colorado tick fever, Orbivirus causes blue tongue disease in sheep, cattle, goats and wild ungulates, Banna virus causes encephalitis and Rota virus is associated with diarrhoea in children.

Chagas disease or American trypanosomiasis, is a tropical parasitic disease caused by the protozoan Trypanosoma cruzi. Q fever is a disease caused by infection with Coxiella burnetii. Whooping cough is a highly contagious respiratory disease caused by the bacterium Bordetella pertussis. Leprosy (Hansen's disease) is a chronic infection caused by the bacteria Mycobacterium leprae.