Read the passage and answer the following.

Microbes are organisms that cannot be seen with the naked eye. They include bacteria, archaea, protists, viruses, prions, and fungi. They account for most of the diversity of life on earth. Far more microbes inhabit a single person's body than there are people on the entire planet. Microbes also dominate in terms of their ability to live and thrive in extreme environments, including clouds, deep-sea volcanoes, springs, ice caps, and animal intestines. Most animals, including humans, exhibit numerous associations with microbes. Our "human microbiome" includes our skin, hair, mouth, and gut.

Which of the following microbe is harmful?

Haemophilus influenzae

The correct answer is Option (1) → Haemophilus influenzae

Haemophilus influenzae:

This is a harmful bacterium that can cause serious infections, such as pneumonia, and other respiratory illnesses, especially in children.

Clostridium butylicum:

This bacterium is generally beneficial as it is used in industrial processes to produce butyric acid, which has various applications in the chemical and food industries.

Cyanobacteria:

Also known as blue-green algae, cyanobacteria are primarily beneficial as they play a crucial role in photosynthesis and nitrogen fixation.

Penicillium notatum:

This is a beneficial fungus that is used to produce penicillin, the first widely-used antibiotic that revolutionized the treatment of bacterial infections.

Haemophilus influenzae is the harmful microbe among the options provided, as it is associated with causing infectious diseases.