Infectious diseases arise from various microorganisms like bacteria, viruses, fungi, and parasites. While many of these organisms reside harmlessly in or on our bodies, certain conditions can lead to disease. Transmission occurs through direct contact, skin-to-skin interaction, bodily fluids, or contaminated surfaces. Some diseases spread via airborne droplets produced by coughs or sneezes, settling on skin or entering the respiratory system of healthy individuals. Bacterial agents cause ailments like strep throat and tuberculosis, while viruses, even smaller, lead to the common cold and AIDS.
Fungal infections encompass skin issues like ringworm and systemic concerns. Parasites, such as those from mosquito bites, induce malaria, while others emerge from contact with animal waste. Symptoms vary, including fever, fatigue, diarrhea, muscle pain, coughing, and runny nose. Timely medical attention is crucial, particularly for persistent or worsening symptoms. Each disease presents distinct indicators, yet shared signs include fever, coughing, and physical discomfort.