The correct answer is Typhoid fever.Concept:Bacteria that can cause disease are known as pathogenic bacteria.Pathogens can spread through the air, skin contact, bodily fluids, etc.Explanation:AIDSThe word AIDS stands for Acquired Immuno Deficiency Syndrome.AIDS is caused by the Human Immunodeficiency Virus (HIV).HIV belongs to the group retrovirus.Transmission of HIV occurs through following ways:By sexual contact with the infected person.By transfusion of contaminated blood and blood products By sharing infected needlesFrom infected mother to her child through placenta.Dengue feverIt is caused by virus Flavivirus.Dengue is transmitted by the bite of a mosquito infected with one of the four dengue virus serotypes.There is no vaccine or any specific medicine to treat dengue. People who have dengue fever should rest and drink plenty of fluids.It is a febrile illness that affects infants, young children and adults with symptoms appearing 3-14 days after the infective bite.COVID-19The COVID-19 pandemic, also known as the coronavirus pandemic, is a global pandemic of coronavirus disease 2019 caused by a coronavirus (SARS-CoV-2) that causes severe acute respiratory syndrome.The majority of people infected with the virus will experience mild to moderate respiratory illness and will recover without the need for special treatment. Some, however, will become critically ill and require medical attention.Typhoid feverIt is caused by pathogenic bacterium Salmonella typhi.It is spread by contaminated food and water.It generally enters the small intestine and then migrates to other organs through blood.Typhoid fever can be confirmed by widal test.