Answer: Cockroaches crawl all over the place. So they will crawl on thingsthat are quite unsanitary and carry the germs to other areas andeven food. Plus, like a number of insects, roaches my crawl in yournose or mouth in your sleep.
There is direct contact: person to person, animal to person and mother to unborn child
There is indirect contact: doorknob, phone, etc.
There is droplet transmission: sneezing, coughing, etc.
There is particle transmission: air particles can transfer infectious diseases
There is Bites and Stings: mosquitoes, lice, ticks, etc.
There is Food Contamination: food, beverages, ice. I.E.-> A person may sneeze in the ice tray at their work, scoop the ice to put in your soda and you drink it. Ice is just as easily contaminated as any food!
Answer: Diseases can be spread sexually (kissing, sharing bodily fluidsetc), airborne(when you cough or sneeze into the air), physicalcontact (germs on your hands, skin diseases, etc). Diseases can bespread in many ways.
Answer: Diseases can be spread ten ways that I know of:
1. Through the air,i.e.by people coughing, sneezing or breathing on you. This is called droplet infection since their breath contains tiny water droplets, containing the harmful microbe.e.g.the flu and influenza.
2. Eating contaminated food, such as chickeni.e.food poisoning.
3. Drinking contaminated water. For example, if sewage has gotten into your drinking water you could catch Salmonella andE-Coli.
4. During sexual intercourse diseases can be passed from one person to another,i.e.syphilis (bacterial); yeast; HPV (viral).
5. Through a cut. For example, if you punctured your foot by stepping on a rusty nail, you could catch Tetanus which is fatal if untreated.
6. From mother to baby through the placenta,i.e.Rubella.
7. Through blood. For example, drug addicts sharing needles could catch HIV. (Human Immunodeficiency virus) Although the USA blood donor supply is scrutinized through massivepre-testing,recipients of donor blood can contact hepatitis, HIV, etc.
8. By touching people.e.g.fungus or bacterial infections. Or by stepping barefoot in public shower areas, i.e. Athletes Foot which is caused by a fungus.
9. Animal bites can spread diseases. for example mosquitoes can carry malaria and dogs can carry rabies.
10. Depressed auto-immune systems or an existing condition which makes a person susceptible to many infections. For example, diabetes can lead to urinary infections and skin or vaginal yeast infections.
Answer: Communicable diseases are most often spread by microrganisms which are transferred from individual to individual by droplet contact (sneezing, kissing, etc.), sexual (bodily fluid) contact, foodborne contact, and water source contact. Sometimes skin to skin contact is sufficient, as well.
Answer: Flood water is not just overflow from streams - flooding often causes sewers to overflow, which of course are very unhygienic places. Since all flood water (from various sources) tends to mix together in areas of flooding, a huge amount of germs can be spread very efficiently over a large vicinity. A secondary issue is that bacteria, molds etc... require water and dampness in order to multiply effectively; flooding allows them not just to spread, but also to multiply.