a public health physician isolated large number of phages from rivers used as a source of drinking water in western africa. They physician is very concerned that humans might become ill from drinking this water, although she knows that the phages specifically attack bacteria. why is she concerned?
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a public health physician isolated large number of phages from rivers used as a source of drinking water in western africa. They physician is very concerned that humans might become ill from drinking this water, although she knows that the phages specifically attack bacteria. why is she concerned?
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- You are working as a virologist for the CDC. In your work you spend much time searching for new viruses found to be infecting Gram Negative organisms to hopefully be able to use them to treat wastewater at wastewater treatment facilities. Which of the following are you searching for? helminths HIV prions bacteriophages viroidsThe genus of bacteria with leaky cell walls which are transmitted among humans by direct contact is:Which statement about Yersinia pestis is false?a) Conditions inside human phagocytes activate virulence genes.b) The bacterium can form biofilms in the flea digestive system.c) Yops protein increases phagocytosis.d) The organism resembles a safety pin in certain stained preparations.e) It was responsible for the “black death” in Europe during the 1300s.
- There have been recurring cases of mad-cow disease in the United Kingdom since the mid-1990s. Mad-cow disease is caused by a prion, an infectious particle that consists only of protein. In 1986, the media began reporting that cows all over England were dying from a mysterious disease. Initially, there was little interest in determining whether humans could be affected. For 10 years, the British government maintained that this unusual disease could not be transmitted to humans. However, in March 1996, the government did an about-face and announced that bovine spongiform encephalopathy (BSE), commonly known as mad-cow disease, can be transmitted to humans, where it is known as variant Creutzfeldt-Jakob disease (vCJD). As in cows, this disease eats away at the nervous system, destroying the brain and essentially turning it into a spongelike structure filled with holes. Victims experience dementia; confusion; loss of speech, sight, and hearing; convulsions; coma; and finally death. Prion diseases are always fatal, and there is no treatment. Precautionary measures taken in Britain to prevent this disease in humans may have begun too late. Many of the victims contracted it over a decade earlier, when the BSE epidemic began, and the incubation period is long (vCJD has an incubation period of 10 to 40 years). A recent study concluded that 1 in 2,000 people in Great Britain carry the abnormally folded protein that causes vCJD. In spite of these numbers, the death rate from vCJD remains low. It is not clear whether this means that the incubation period for the disease is much longer than previously thought, or whether they may never develop the disease. If you were traveling in Europe, would you eat beef? Give sound reasons why or why not.There have been recurring cases of mad-cow disease in the United Kingdom since the mid-1990s. Mad-cow disease is caused by a prion, an infectious particle that consists only of protein. In 1986, the media began reporting that cows all over England were dying from a mysterious disease. Initially, there was little interest in determining whether humans could be affected. For 10 years, the British government maintained that this unusual disease could not be transmitted to humans. However, in March 1996, the government did an about-face and announced that bovine spongiform encephalopathy (BSE), commonly known as mad-cow disease, can be transmitted to humans, where it is known as variant Creutzfeldt-Jakob disease (vCJD). As in cows, this disease eats away at the nervous system, destroying the brain and essentially turning it into a spongelike structure filled with holes. Victims experience dementia; confusion; loss of speech, sight, and hearing; convulsions; coma; and finally death. Prion diseases are always fatal, and there is no treatment. Precautionary measures taken in Britain to prevent this disease in humans may have begun too late. Many of the victims contracted it over a decade earlier, when the BSE epidemic began, and the incubation period is long (vCJD has an incubation period of 10 to 40 years). A recent study concluded that 1 in 2,000 people in Great Britain carry the abnormally folded protein that causes vCJD. In spite of these numbers, the death rate from vCJD remains low. It is not clear whether this means that the incubation period for the disease is much longer than previously thought, or whether they may never develop the disease. What measures have been taken to stop BSE?Which of the following diseases is NOT controlled by a mosquito control program? Group of answer choices A) Yellow fever B) Dengue fever C) Leprosy D) Malaria
- Why is it incorrect to say that bacteria produce toxins to harm their host?An outbreak of a vector borne disease along a river system in centrla Uganda has been identified, triggering a national alert. Patients present with complex neurological symptoms and flagellated parasites have been isolated from local animals. Based on the above information, what pathogen do you suspect might be the cause? And why? To control the outbreak, what treatments and interventions would be the most effective?Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions? "This is a highly contagious respiratory illness transmitted when an infected person coughs or sneezes virus particles into the air," the health department said in a written statement. "It's so contagious that if one person is sick and spreading measles, nine out of 10 people around them who aren't immune will get it, too." Group of answer choices a. Measles b. Parvovirus c. Coxsackie virus A d. Rhinovirus
- How is a provirus related to disease symptoms? A-the provirus continually lyses cells, causing disease symptoms B-the provirus periodically shifts to a lytic cycle, causing disease symptoms C-the provirus can produce endospores during unfavorable times D-the provirus secretes powerful toxins that make the host illWhy is it very unlikely that the Zika virus will become a permanent resident of Michigan?Can you tell me about a scientist that has advanced humanity's knowledge about malaria, please?