What are infectious diseases? Describe how infectious diseases spread? please write 300-400 words
Answers
Explanation:
Infectious diseases commonly spread through the direct transfer of bacteria, viruses or other germs from one person to another. This can happen when an individual with the bacterium or virus touches, kisses, or coughs or sneezes on someone who isn't infected.Infectious diseases are caused by microorganisms such as viruses?, bacteria?, fungi or parasites?.
Microorganisms that cause disease are collectively called pathogens.
Pathogens cause disease either by disrupting the bodies normal processes and/or stimulating the immune system to produce a defensive response, resulting in high fever, inflammation? and other symptoms.
Infectious diseases can be spread from one person to another, for example through contact with bodily fluids, by aerosols (through coughing and sneezing), or via a vector, for example a mosquitoInfectious diseases are one of the leading causes of death worldwide.
Many diseases become difficult to control if the infectious agents evolve resistance to commonly used drugs:
For example, bacteria can accumulate mutations? in their DNA? or acquire new genes? that allow them to survive contact with antibiotic drugs? that would normally kill them.
Scientists are currently searching for new approaches to treat infectious diseases, focusing on exactly how the pathogens change and drug resistance? evolves.