How many of the following are bacterial disease :Ascariasis, Filariasis, Ringworm, Polio, Plague, pneumonia, mumps, Common cold, typhoid

Out of the diseases mentioned, Plague, Pneumonia, Common cold, and Typhoid are bacterial diseases. So, there are 4 bacterial diseases in the list provided.

Here's a brief explanation:

1. Ascariasis: This is a disease caused by a parasitic roundworm. So, it's not a bacterial disease.

2. Filariasis: This is caused by infection with parasites classified as nematodes (roundworms) in the family Filarioidea. So, it's not a bacterial disease.

3. Ringworm: Despite its name, ringworm is a fungal infection, not a worm.

4. Polio: Polio is caused by the poliovirus. So, it's a viral disease, not a bacterial one.

5. Plague: Plague is caused by the bacterium Yersinia pestis. So, it's a bacterial disease.

6. Pneumonia: Pneumonia can be caused by bacteria, viruses, or fungi. The most common type is bacterial pneumonia, which is caused by the bacterium Streptococcus pneumoniae.

7. Mumps: Mumps is caused by the mumps virus. So, it's a viral disease, not a bacterial one.

8. Common cold: The common cold is a viral infection primarily caused by rhinoviruses. However, it can sometimes be caused by bacteria.

9. Typhoid: Typhoid is caused by the bacterium Salmonella typhi. So, it's a bacterial disease.