Why do some antibiotics affect particular bacteria and not others?

Why do some antibiotics affect particular bacteria and not others?

The more antibiotics are used, the more resistant the bacteria can become because sensitive bacteria are killed, but stronger germs resist the treatment and grow and multiply.

Why do some antibiotics work better on different bacteria?

Resistant bacteria can pass their genes to other bacteria, forming a new antibiotic-resistant ‘strain’ of the bacteria. The more antibiotics are used, the more chances bacteria have to become resistant to them. As more antibiotics stop working against bacterial infections, doctors will have fewer antibiotics to use.

What are two specific reasons why antibiotics don’t work on viruses?

Why don’t antibiotics work on viruses? Viruses are different to bacteria; they have a different structure and a different way of surviving. Viruses don’t have cell walls that can be attacked by antibiotics; instead they are surrounded by a protective protein coat.

Why do we use different antibiotics for different infections?

Antibiotics are usually grouped together based on how they work. Each type of antibiotic only works against certain types of bacteria or parasites. This is why different antibiotics are used to treat different types of infection.

Why do bacteria become resistant to antibiotics?

Bacteria develop resistance mechanisms by using instructions provided by their DNA. Often, resistance genes are found within plasmids, small pieces of DNA that carry genetic instructions from one germ to another. This means that some bacteria can share their DNA and make other germs become resistant.

Why are antibiotics not effective against viral diseases Class 9?

Antibiotics are not effective against viruses because they cannot inhibit viruses as bacteria and viruses have different strategies and machinery to survive and replicate. The antibiotic has no substrate to bind to in a virus. An antibiotic is a kind of antimicrobial drug active mainly against bacteria.

Why are some bacteria resistant to antibiotics?

Why do antibiotics only work on bacteria?

Antibiotics cannot kill viruses because bacteria and viruses have different mechanisms and machinery to survive and replicate. The antibiotic has no “target” to attack in a virus. However, antiviral medications and vaccines are specific for viruses.

Why are antibiotics ineffective against viruses Class 8?

Viruses do not self replicate, instead use the host machinery to make multiple copies of them. They infect healthy cells and reprogram them to make multiple copies of their genome. This is the reason why antibiotics are not effective against viruses.

Can you take two different antibiotics at the same time for different infections?

There’s an increased risk of side effects if you take 2 doses closer together than recommended. Accidentally taking 1 extra dose of your antibiotic is unlikely to cause you any serious harm. But it will increase your chances of getting side effects, such as pain in your stomach, diarrhoea, and feeling or being sick.

What are the different classes of antibiotics?

In this portal, antibiotics are classified into one of the following classes: penicillins, fluoroquinolones, cephalosporins, macrolides, beta-lactams with increased activity (e.g. amoxicillin-clavulanate), tetracyclines, trimethoprim-sulfamethoxazole, lincosamides (e.g. clindamycin), urinary anti-infectives, and other …

What type of bacteria is resistant to antibiotics?

Some bacteria have developed resistance to antibiotics that were once commonly used to treat them. For example, Staphylococcus aureus (‘golden staph’ or MRSA) and Neisseria gonorrhoeae (the cause of gonorrhoea) are now almost always resistant to benzyl penicillin.

Why do antibiotics become less effective over time?

Each time you take antibiotics, you are more likely to have some bacteria that the medicine does not kill. Over time these bacteria change (mutate) and become harder to kill. The antibiotics that used to kill them no longer work. These bacteria are called antibiotic-resistant bacteria.

What are antibiotics and how do they work?

What are antibiotics? Antibiotics are powerful medicines used to treat certain illnesses. However, antibiotics do not cure everything, and unnecessary antibiotics can even be harmful. There are 2 main types of germs that cause most infections. These are viruses and bacteria.

Why are antibiotics selective?

The bacteria which is using given antibiotics want to survive. Hence, antibiotics are selective. In other words, certain infections are caused by specific strains of bacteria and hence some antibiotics are highly effective and others not. Optimally, the most effective antibiotics become from a competing bacterial strain.

Do antibiotics kill all germs?

However, antibiotics do not cure everything, and unnecessary antibiotics can even be harmful. There are 2 main types of germs that cause most infections. These are viruses and bacteria. Antibiotics cannot kill viruses or help you feel better when you have a virus. Antibiotics do kill specific bacteria.