Poultry International - March 2018 - 25

PoultryInternational ❙ 25

drugs have become ineffective and, in some cases,
resistant bacteria may "co-select for other traits that
make them more dangerous to humans, for example,
more likely invade the bloodstream."

Complexity of emergence and spread
Pew notes that the molecular processes by which
resistance emerges, spreads and potentially disappears are complex.
Some resistant genes occur naturally, fully independent of exposure to antibiotics.
Additionally, not every antibiotic works against
every type of bacterium. For instance, an antibiotic
may be effective only in killing bacteria with a certain type of molecular structure, leaving those without that structure unaffected.

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Bacteria can acquire antibiotic resistance through
various mechanisms. It may be acquired sequentially, and how quickly this occurs depends on several
factors, including the bacterium type, the negative
effect any changes have, and the nature of antibiotic
exposure.
However, bacteria can also quickly develop
resistance when they share their resistance genes.
Bacteria can also share several genes at the same
time, including those that confer traits unrelated to
resistance, which can complicate resistance dynamics through a process called co-selection.
In co-selection, resistance genes are physically
linked to genes carrying other traits. This can cause
bacteria no longer exposed to antibiotics to retain
their resistance properties. Because of this, resistance may appear or disappear significantly faster in
some situations than in others, and perhaps not at all
during a period of study. ■

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Table of Contents for the Digital Edition of Poultry International - March 2018

Poultry International - March 2018
Contents
Editor’s Comment
News
Brazilian poultry industry outlook positive for 2018
Why European egg production may be flat in 2018
VIV Europe to address challenges for food, ag sectors
Moy Park opens UK’s largest single-build hatchery
French chicken farmer shares antibiotic-free success
3 animal antibiotics, human health risk questions answered
Tips for feeding chickens in a start-up poultry business
How to optimize chicken feather plucking during processing
Products
Marketplace
Poultry International - March 2018 - BB1
Poultry International - March 2018 - BB2
Poultry International - March 2018 - Poultry International - March 2018
Poultry International - March 2018 - Cover2
Poultry International - March 2018 - Contents
Poultry International - March 2018 - Editor’s Comment
Poultry International - March 2018 - 3
Poultry International - March 2018 - News
Poultry International - March 2018 - 5
Poultry International - March 2018 - Brazilian poultry industry outlook positive for 2018
Poultry International - March 2018 - 7
Poultry International - March 2018 - 8
Poultry International - March 2018 - 9
Poultry International - March 2018 - Why European egg production may be flat in 2018
Poultry International - March 2018 - 11
Poultry International - March 2018 - 12
Poultry International - March 2018 - 13
Poultry International - March 2018 - VIV Europe to address challenges for food, ag sectors
Poultry International - March 2018 - 15
Poultry International - March 2018 - Moy Park opens UK’s largest single-build hatchery
Poultry International - March 2018 - 17
Poultry International - March 2018 - French chicken farmer shares antibiotic-free success
Poultry International - March 2018 - 19
Poultry International - March 2018 - 20
Poultry International - March 2018 - 21
Poultry International - March 2018 - 3 animal antibiotics, human health risk questions answered
Poultry International - March 2018 - 23
Poultry International - March 2018 - 24
Poultry International - March 2018 - 25
Poultry International - March 2018 - Tips for feeding chickens in a start-up poultry business
Poultry International - March 2018 - 27
Poultry International - March 2018 - 28
Poultry International - March 2018 - 29
Poultry International - March 2018 - How to optimize chicken feather plucking during processing
Poultry International - March 2018 - 31
Poultry International - March 2018 - 32
Poultry International - March 2018 - 33
Poultry International - March 2018 - 34
Poultry International - March 2018 - 35
Poultry International - March 2018 - Products
Poultry International - March 2018 - 37
Poultry International - March 2018 - 38
Poultry International - March 2018 - Marketplace
Poultry International - March 2018 - 40
Poultry International - March 2018 - Cover3
Poultry International - March 2018 - Cover4
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