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Decreasing Function01:27

Decreasing Function

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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Production of High-Titer Infectious Influenza Pseudotyped Particles with Envelope Glycoproteins from Highly Pathogenic H5N1 and Avian H7N9 Viruses
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Deciphering the Sharp Decrease in H7N9 Human Infections.

Xu Zhang1, Tingting Luo1, Yongyi Shen2

  • 1College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.

Trends in Microbiology
|November 27, 2018
PubMed
Summary
This summary is machine-generated.

A new bivalent H5/H7 vaccine has nearly eliminated human infections from the H7N9 virus. This avian influenza vaccine successfully prevented infections in chickens, a key step in controlling human transmission.

Keywords:
H7N9evolutionvirulence

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Area of Science:

  • Veterinary Medicine
  • Infectious Diseases
  • Public Health

Background:

  • The H7N9 influenza virus has caused multiple waves of human infections since 2013.
  • Recent surveillance indicates a significant decrease in human H7N9 cases over the past year.

Purpose of the Study:

  • To investigate the impact of a novel bivalent H5/H7 vaccine on H7N9 virus transmission.
  • To assess the vaccine's efficacy in preventing avian infections and subsequent human transmission.

Main Methods:

  • The study involved the administration of a bivalent H5/H7 vaccine to poultry.
  • Subsequent monitoring of H7N9 infection rates in chickens and epidemiological data on human infections were analyzed.

Main Results:

  • The bivalent H5/H7 vaccine demonstrated high efficacy in preventing H7N9 infections in chickens.
  • A near-elimination of human H7N9 infections was observed following the widespread use of the vaccine in poultry.

Conclusions:

  • Vaccination of poultry with a bivalent H5/H7 vaccine is a highly effective strategy for controlling H7N9 avian influenza.
  • This approach has proven successful in nearly eradicating human H7N9 infections, highlighting the importance of animal health in public health outcomes.