Infection is the invasion of a host organism’s bodily tissues by disease-causing organisms, their multiplication, and the reaction of host tissues to these organisms and the toxins they produce. Infections are caused by microorganisms such as viruses, prions, bacteria, and viroids, and larger organisms like macroparasites and fungi. Hosts can fight infections using their immune system.
Once we reach a certain age, it can be a challenge to maintain healthy practices. For instance, some seniors are living with a disability, while others live alone and don’t realize the...