Getting wet does not induce pneumonia; rather, a bacterial or viral infection does. A cold or flu that worsens might develop into pneumonia. This is because the cold or flu irritates the lungs, making it easier for pneumonia bacteria to enter and develop an infection. The best defense against developing pneumonia is to stay away from people who are sick and seek medical care if you experience any symptoms of illness. Pneumonia can be caused by many different organisms. The most common causes include Streptococcus Pneumoniae, Haemophilus Influenzae, Mycoplasma Pneumoniae, Chlamydia Pneumoniae, and the Coronavirus. Some people are more likely to develop pneumonia due to certain factors related to their genetics or health history. For example, smokers over the age of 60 who do not take precautions to prevent asthma attacks can develop acute respiratory distress syndrome (ARDS) due to multiple reasons including pneumonia. Running in the rain can be dangerous if you are not trained to do so. If you are already prone to lung problems like asthma or emphysema, then being immersed in water that quickly increases in temperature could have adverse effects on your body system. Lungs are part of the body's heat exchange system so they absorb much of the heat from our bloodstream when we exercise in hot temperatures.