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Arthropods are a major area of human health.
This is because they can do which of the following things? Pick all the correct answers.
| A. |
They can cause areas of necrosis or allergic reactions due to bites and stings. |
|
| B. |
They can be biological vectors. |
|
| C. |
They can be mechanical vectors. |
|
| D. |
They can be |
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- Which of the following is not considered an insect vector?a. flea b. mosquito c. tickd. tsetse flyHost defenses that are most active in worm infestations:a. phagocytes b. antibodies c. killer T cells d. eosinophilsThree methods have been used to try to eliminate malaria. One is to eliminate the mosquito vectors of the parasite, a second is to kill the parasites after they have entered the human body, and the third is to develop a vaccine against the parasite, allowing the human immune system to provide protection from the disease. Which do you suppose is the most promising in the long run? Why? Think about both the biology of the disease and the efficacy of carrying out each of the methods on a large scale .
- There are often no clinical symptoms associated with worm infections. Select one: a. True b. FalseWhen an arthropod bites and injects a pathogen into the new host, this route of infection is called___ a. biological vector b. direct contact c. chemical route of infectionwhich of the following attributes is not common to the life and transmission cycles of parasitic flukes? a. They are transmitted by consuming inadequately cooked fish b. eggs are released in the feces c. fresh water snails are an intermediate host d. infection causes obstruction of the bile duct
- discuss methods used to control vector-borne diseases, specifically mosquitos. 1) Is there one method you think is more beneficial than others when it comes to the controlling and prevention of mosquito-borne diseases? Why/why not? 2) Also, how large do you think is the impact of human environmental change (man's activities) on emerging infectious diseases in animals and man?Why antibacterial drugs are ineffective against: A. Fungal Infections B. Viral infections C. Helminthic worm infectionsThink about the cells that viruses infect. Pick out the correct statements below. A. The host cell has some particular thing - be it machinery, chemistry or whatever - that the virus MUST have in order to successfully reproduce. B. Viruse generally don't care what cells they infect. C. Viruses can only replicate in particular hosts and tissues. D. The host range or tissue specficity means the specific type of cells the virus infects. Example - rabies infects neural cells.
- Which of the following is not true? a. Cockroaches can transport a variety of parasites, usually on their external surface. This is an example of mechanical transmission by a vector b. A contamination will inevitably lead to an infection c. Case fatality rate is one of the indicators of virulence of an infectious agent d. None of the pandemics prior to COVID-19 were caused by a coronavirusDrugs are often given to patients before going into surgery, to dentalpatients with heart disease, or to healthy family members exposed tocontagious infections.a. What word would you use to describe this use of drugs?b. What is the purpose of this form of treatment?c. Explain some potential undesired effects of this form of therapy.d. Define probiotics and list some ways they are used.a. Why is it necessary for most parasites to leave their host to complete the life cycle? b. What are some ways to prevent completion of the life cycle? c. What is the benefi t to parasites of having numerous hosts? d. What are the disadvantages in having more than one host?