What is the major contributor to the increase in antibiotic resistance in bacteria?
Antibiotic resistance is a consequence of evolution via natural selection. The antibiotic action is an environmental pressure; those bacteria which have a mutation allowing them to survive will live on to reproduce. They will then pass this trait to their offspring, which will be a fully resistant generation.
What has led to the evolution of antibiotic resistant bacteria quizlet?
evolution of antibiotic-resistant bacteria? The presence of an antibiotic in an environment leads to the selection of those individuals that are most resistant to it. some insects have a gene that makes them resistant to the pesticide. the frequency of resistant insects in the population increases.
How do bacterial mutations make bacteria resistant to antibiotics quizlet?
53 How do bacterial mutations make bacteria resistant to antibiotics? The mutation either disables or counteracts the antibiotic so the bacteria can live in the presence of antibiotics. The mutation causes the bacteria to move to another part of the body where the antibiotic is not present.
Why are scientists concerned about the H5N1 flu virus quizlet?
Why are scientists concerned about the H5N1 flu virus? -Viral reassortment can add to the genetic variation of a virus within a host by producing new combinations of genes not seen before.
What is most likely the author’s purpose in this passage when birds get flu?
Explanation: In the passage from “When Birds Get Flu,” the author John DiConsiglio intends to provide additional information about the circumstances surrounding the origins of the bird flu.
What is the origin of H5N1 virus quizlet?
– The first avian influenza virus to infect humans occurred in Hong Kong in 1997. – The epidemic was linked to chickens and classified as avian influenza A (H5N1). – Human cases of avian influenza A (H5N1) have since been reported in Asia, Africa, Europe, Indonesia, Vietnam, the Pacific, and the near East.
Why is influenza so virulent?
Flu viruses that ‘jump’ from another animal, such as a bird, cause severe disease in the lungs. During these infections, the virus produces molecules called mini viral RNAs that trigger strong immune responses.
Which sign or symptom commonly occurs with avian H5N1 influenza?
Q5: What are the symptoms of H5N1 avian influenza in humans? The symptoms of H5N1 infection may include fever (often high fever, > 38°C) and malaise, cough, sore throat, and muscle aches. Other early symptoms may include abdominal pain, chest pain and diarrhoea.
Which population was mainly affected by the H1N1 influenza outbreak of 1977?
The Russian Flu began in May 1977, when influenza A/H1N1 viruses isolated in northern China spread rapidly, and caused epidemic disease in children and young adults (< 23 years) worldwide.
What is the deadliest flu strain?
The 1918 H1N1 flu pandemic, sometimes referred to as the “Spanish flu,” killed an estimated 50 million people worldwide, including an estimated 675,000 people in the United States. An unusual characteristic of this virus was the high death rate it caused among healthy adults 15 to 34 years of age.
What was the most severe flu outbreak of the 20th century?
Three worldwide (pandemic) outbreaks of influenza occurred in the 20th century: in 1918, 1957, and 1968. The latter 2 were in the era of modern virology and most thoroughly characterized. All 3 have been informally identified by their presumed sites of origin as Spanish, Asian, and Hong Kong influenza, respectively.
When was the last major flu epidemic?
The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919.