How do bacteria primarily make us feel ill?

Bacteria primarily make us feel ill by producing toxins that damage cells and tissues. When pathogenic bacteria invade the body, they can secrete harmful substances known as toxins. These toxins can disrupt normal cellular functions, leading to cell and tissue damage. This often results in inflammation and other immune responses that manifest as illness.

The severity of the illness depends on the type of toxins produced and their effects on biological processes. Some toxins can interfere with nerve functions, while others may provoke a strong inflammatory response. The body’s immune system reacts to these toxins by attempting to neutralize them, which can contribute to the symptoms experienced during an infection, such as fever, pain, and fatigue.

In contrast, other options, such as releasing harmful gases or consuming nutrients needed by the body, are not the primary means through which bacteria cause illness. Additionally, while some bacteria can trigger allergic reactions, this is not the main mechanism by which bacterial infections lead to sickness. The primary pathogenic action of harmful bacteria is indeed through the production of toxins.