America is a nation that loves its pets, and it's impossible to put a value on the pleasure that our furry, feathery, or even scaly friends provide.

However, on the negative side of the ledger, there are some health costs that often go overlooked but which can sometimes have serious or even deadly consequences.

We've all become accustomed in recent times to fears over swine flu and bird flu, but the health risks posed by animals don't need to include the word pandemic in order to be worthy of our awareness and diligence in minimizing.

Neither do the animals need to be mighty of claw or fangs, as we'll see as we run through five of the most common health threats posed by household pets.

Up first, this pet could leave you Itchy And Scratchy ...

cat looking at camera

Eczema

In the world of "The Simpsons," Itchy and Scratchy are a cartoon mouse and a cartoon cat, and the mouse goes around inflicting pain on the cat.

In many households, however, it may be cats that pass on the pain by causing an allergic reaction to those who suffer from skin conditions.

Of course, the exposure to animal fur (whether cat or other animal) isn't the cause of eczema. It just happens to be one irritant that may trigger an outbreak of eczema, and there are many other irritants that exacerbate the condition, such as house dust and pollen.

Therefore, before banning Fluffy or Fido from the house, it's worth asking for patch testing to determine which allergens are the specific trigger for your eczema or your kid's.

Ever wonder when a worm isn't really a worm?

dog on couch

Ringworm

Dogs may be man's best friend, with cats not far behind, but both are frequently responsible for instances where humans develop ringworm. Despite its name, ringworm is a fungal infection rather than being caused by any worm.

Ringworm is an example of a zoonotic disease, one that can be transmitted from animals to humans. Infection can be transmitted either through contact with a ringworm-infected pet or with its bedding or other items that it has been in contact with.

Circular bare patches on the pet's skin may signify the presence of ringworm, although, frustratingly, an animal can sometimes play host to the condition without displaying any telltale signs.

Ringworm leads to itchy discomfort, but the good news is that it is easily treatable with topical agents and should be eradicated within a couple of weeks.

Take a deep breath before you read about our next health risk ...

bunny rabbit in grass

Asthma

Just as exposure to animal fur can inflame eczema, it can also add to asthma problems.

Asthma is a common respiratory condition that is normally treated effectively through the use of inhalers. However, the condition can escalate into a full asthma attack, which is very dangerous and can be fatal.

There is a high linkage between people suffering from asthma and eczema and being allergic to animal hair and saliva. While cats and dogs are the most common culprits, asthma sufferers may suffer an allergic reaction to a wide range of animals, including mice, rats, rabbits, and horses.

Regular vacuuming, avoiding excessive skin to fur contact, and choosing animals species that aren't heavy molters may minimize the effects.

However, where animal allergens are contributing to persistent and severe asthma, the best course of action may be to find a new home for your pets.

But even if your pet doesn't have any fur, there are still risks ...

pet turtle in child's hand

Salmonellosis

With animal hair a common allergen, there may be a temptation to move away altogether from mammals as pets.