ऐतिहासिक रूप से, हैजा (कॉलरा) के कारण कुल कितनी प्रमुख वैश्विक महामारियाँ (Pandemics) दर्ज की गई हैं?

Which of the following groups consists exclusively of diseases caused by bacterial infections?

Which of the following groups of biological agents are the primary carriers in contaminated water that cause waterborne diseases such as cholera, typhoid fever, and dysentery?

Identify the bacterial disease from the following options: