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Why does an antibiotic not work the same for all bacteria?
Bacteria also do evolve. If one bacteria is mutated, and survives an attack by antibiotic, he multiplies and forms more bacteria which are more resistant against antibiotic. As days of surviving antibiotics and multiplying eventually creates a bacteria which is resistant against it.
Why do scientists have to find a new antibiotic to kill bacteria?
After releasing enough of one type of antibiotic onto some bacteria, given enough time the bacteria will adapt, and even change to be unaffected by the given antibiotic. The only way to inhibit the bacteria then is find a new, better antibiotic, after which, given enough time and exposure, the bacteria will get used to this antibiotic, so there is again a need for a new one.
How is evolution taking place in antibiotic and bacteria?
This may not be the answer you're looking for exactly, but evolution doesn't exist. Maybe the organisms have changed slightly over time (natural selection) but they did not completely evolve. God created them as they are.
Why is irresponsible use of antibiotics could have serious long-term consequences?
Yes. The risk is in the creation resistant strains of the affected bacteria. If someone does not use the antibiotics apropriately the bacteria will develope immunity to the antibiotic. Then subsequent people infected with the strain will not be cured by the previous antibiotic. Eventually strains can evolve into one that is resistant to most antibiotic therapy, making treatment very difficult, more invasive, and more dangerous to the patient Didn't I say that in the answer you deleted???
Why does antibiotic resistance evolve in bacteria?
A random mutation in one bacteria can result in this. think of a huge population of bacteria. billions of bacteria. and only 5 or so have the resistance by a random chance (random mutation). the antiobiotics will kill all of bacteria, except for the 5 with the resistance. Then, only those 5 will reproduce. since they reproduce asexually, this resistance will be passed on to all of the daughter. Then, all of sudden, there are a lot of bacteria around that are resistant to the antibiotic... it can also occur by conjugation, which is when a bacteria inserts its DNA into another bacteria. this can result in the second bacteria having the resistance too. this is a very basic description of the process.
Do some species of insects and bacteria change?
All bacteria can mutate and evolve, Methicillin Resistant Staphylococcus Aureus (MRSA) is the best example of a bacteria changing to adjust to its environment.
Why do vaccines have to be changed every year?
Because certain viruses and bacteria evolve to become resistant to the old vaccines.
What is antibiotic resistance and how does it occur?
Bacteria and other microorganisms that cause infections are remarkably resilient and can develop ways to survive drugs meant to kill or weaken them. This antibiotic resistance, also known as antimicrobial resistance or drug resistance, is due largely to the increasing use of antibiotics.
Why are some bacteria resistant to antibiotic drugs?
Bacteria can become resistant by many means. Antibiotics can affect several different parts of a bacterium such as cell wall synthesis (the penicillins affect this) or protein synthesis and several others. If for example an antibiotic affects cell wall synthesis by inhibiting an enzyme then if the bacteria mutates to overproduce that enzyme then it becomes resistant to that antibiotic at therapeutic concentrations. Or the bacteria could mutate so it does not need that exact enzyme any more and the antibiotic becomes useless. Some of the dangerous pathogens like methicillin resistant Staphylococcus aureus (MRSA) have acquired resistance to several antibiotics by selective mutation (otherwise known as evolution). Some bacteria are not so good at mutating or are less dangerous as pathogens so they cannot acquire resistance at all or as quickly.Other bacteria can produce spores which are very tough capsules which contain all the genes of a bacterial species but are not viable cells, the spores are highly resistant to antibiotics because they are very thick and do not carry out normal cellular functions so they are not affected by antibiotics. Anthrax and Clostridium dificille can form spores.Some bacteria like Listeria and in some cases Staphylococcus aureus can get inside the human cell like a virus and become resistant to the immune system and also to drugs because it is harder for drugs to get inside a human cell.
Can antibiotics cause resistance in bacteria?
A simple way to explain it is:When you have an infection and take antibiotics for it, the weaker bacteria are killed first, with the stronger ones surviving, or taking longer to destroy. So when you don't take the full round of antibiotics, the stronger bacteria are the ones left in your body, and they are the ones that will continue to multiply, resulting in a bacteria resistant to the antibiotic. This is why you should always take the full prescribed course of antibiotics.Also, when antibiotics are prescribed, the body's natural defense system (the good bacteria) are destroyed along with the bad bacteria. This is why you should always eat yogurt with active cultures or drink buttermilk while on antibiotics - the active cultures put the "good" bacteria back in the body.
What is one advantage of restricting the use of antibiotics?
The germ causing the infection can become resistant ("immune") to the antibiotic, then it will basically make it useless in the fight against that germ.
Why is there not a cure for salmonella?
The trick with curing a bacterial infection is to find something that will kill that particular type of bacteria, but which will not kill human cells. Since the biochemistry of human cells is very similar to that of bacteria, most of the things that kill bacteria will also kill human cells. You do not want to cure a disease at the expense of killing the patient. So, there is no guarantee that such cures can be found. You can do research into various antibiotics, but you may or may not find something that works. Furthermore, even when you do find a good antibiotic, bacteria tend to evolve resistant strains which can no longer be killed by that particular antibiotic. Bacteria are very tough, adaptable organisms. Do not underestimate them.
