Why human get sick or ill more than animals and birds? even they doesn't takes any medicines?
400313
Most animals that get ill hide it to keep predators from getting attacked. When animals do get sick they tend to die quickly.\n\nThe fact that they die from disease also means they cannot pass it on so easily, either genetically or by contact.\n\nThe other big issue in my mind is that we live such horribly unhealthy lifestyles today- bad diet, no exercise/active lifestyles, environmental pollutants (indoors is often worse than outside in a bad city!), avoiding germs artificially instead of building immunity, letting bad genes build up in our genotype, etc.
399351
if you are refering to the avian bird flu in the news, only about 100 ppl have died of this in the last 3 years. i think we have more to worry about such as the effects of drugs, alcohol and sexually transmitted dieases than birds killing us.
791055
it is impossible to answer the first question since at the big bang there was at lest the first  thousand years no atoms.\n\nMany animals  need oxygen  for their need in energy. But for some bacteria oxygen is a poison\n\nOxygen is important to animals since the nervous cells  die quickly without oxygen
793652
if you have been bitten by an animal in the past before you got sick, you might have rabies. please, if you think you will get better on your own, don't assume. go see a doctor 'cause you might have something serious.
48536
Also, if u don't eat birds (if ur a vegetarian) u won't get the bird flu. Vegetarianism also has a lot of other benefits. The PETA and Vegan Outreach websites have a lot of info on that.
881798
I used to work in ER registration and was exposed to everything.  My only answer was maybe we built up an immunity to some diseases, or we just were to work conscious to get sick.  The doctors do get sick, but they also have quicker access to treatment than the average person does.  And they also have   samples of the latest, most effective  meds given out by medical sales people.
767505
Birds and fowl lack smooth muscles in their throats to pull food and water down to their stomach.  Therefore they have to lift up their heads and let it fall.  This is why you can't bring a canary in outer space because it would starve/dehydrate.
420430
Supposedly we have "created" viruses and bacteria that are resistant to our treatments. It happens when you don't take all of your medicine a doctor gives you, the medicine starts to act but when you stop (if you don't take it all), the bacteria now have the "information" on that medicine and they then mutate to make themselves immune to it.
1074610
Sometimes, by the way we live, lack of sleep, poor eating choices, etc. Sometimes we're just hypochrondriacs stressed out for nothing. More often, it's not our fault.  It's bacteria, diseases & hereditary.
466485
Animal diseases vary just like human diseases, so there are many different affects.  Do you mean what are the affects in humans?
1025133
animals get infected by viruses...some viruses can infect both human & animals...some will show deffernt symptoms in animals than in human...some viruses show symptoms in human but they don't in animals so animals are called in this case: carriers...\nas for common cold:there are different serotypes each infect & show symptoms in different species..\nwhy do a virus infect a species not a nother??if this is what U mean: it depends on the outer structure of the virus, there are diferent types of receptors on the outer structure (envelope or wall...etc..)that will be attached to it's maching place in the cell it attackes....then the infection will begin...if the place on cell doesn't mach : no infection will be done..
247907
Because they are natural carriers.  Their immune system is designed to deal with it.
584878
If you think about it-you see thousands of humans every week-probably, I would guess, something like 10,000 times more humans than any other animal..and yet how often have you seen a human drop from a heart attack, or even the much more common falling from a dizzy spell?  It isn't a common enough occurance to see regularly- Occasionally you will see a bird out of a large flock dropping, usually in a controlled manner- A bird will drop to the ground when it start to feel ill..it won't usually just fly until it drops or passes out.  I have found numerous birds that appeared stunned.  Most were likely from hitting windows, but I can't be sure of that.  From speaking to my veternarian friends, on average humans are more healthy, not less, than the great majority of animals-and if you add in animals in the wild, it's not even close.  Many, if not most, wild animals suffer from parasites of various kinds, and often from infections and poorly healed injuries.  It has nothing at all to do with exercise-pets that live in a house, and get much less exercise than feral dogs and cats live much longer, healthier lives.  The effect of better diet, less stress, modern health care is a much larger factor in health than exercise is-as is obvious from the fact that, even though humans get much less exercise now than 100 years ago, we live much much longer.  That being said, the combination of better diet, less stress, modern medicine *and* plenty of exercise is better still.
210840
Genetics, and also other factors such as mood, fitness, and activity.  If your sad all the time, or lay around all day doing nothing, this can affect your immune system. It's been proven that happy people get sick much less frequently than sad people and also that they recover from sickness or injury more quickly.
438655
Some viruses are not specific to animals or to humans and can be passed back and forth.  For example, the avian flu.  \nAlso, horses are susceptible to many human ailments.  These viruses are transferred just like any virus, through ingestion of some sort.  This means you breath it in if it is a virus that can survive while airborne, or you can eat it, drink it or get it into your body through sores or sensitive areas like your eyes or "other areas"(HIV).  Say an animal is sick and you kill it and eat it.  Maybe the virus withstands great heat and cooking the meat of the infected animal doesn't kill it.  Eating the meat will pass the virus.  You could touch the sick animal, get contaminated saliva on your hands and then you touch your mouth or eyes; you will get sick. \n\nMost viruses are specific to certain species though.  An animal virus only affects animals and a human virus only affects humans.  Still these viruses can mutate into a virus that affects humans and animals.  That is what is so scary about viruses.  They multiply quickly and mutations are very common.
131130
Could be. Chimps are able to get infected and not get sick. At one time in their evolutionary process they probably had the same fate as humans do now.
73564
You only get sick from germs...but....when your body temp drops due to cold weather and your hair chills you rather than warms you...you make your body more prone to illness as your defenses drop.