by M. J. Joachim

Created on: February 07, 2009

Viruses on Parade

There are three known types of viruses that cause the flu. Scientists have labeled them A, B, and C. Type A flu virus is potentially deadly, and has been known to cause flu pandemics, as it spread throughout the world. Type B is also very severe, though not as severe as type A. Type C is milder. Sometimes, it doesn't even produce the achy symptoms associated with the flu.

Flu Virus Invasion

The flu is caused when viruses attach themselves to living cells. The purpose of all viruses is to conquer living cells, multiplying and invading the surrounding area. Flu viruses enter through the respiratory system. They usually attach themselves to our bodies in the nose and mouth first, and then quickly move throughout our upper and lower respiratory system, until we begin to ache all over.

As flu viruses spread, they overcome every built in defense system meant to keep them out. Mucous overflows, making us wheeze, cough, and blow our noses until they feel like they will fall off our faces. Tonsils and adenoids swell, making our throats sore, and voices hoarse. Breathing airways become constricted, forcing our lungs to work harder than ever.

Eventually, all we can do is sleep, hoping that our bodies will find the strength to fight against the unwanted invaders. We make a point to drink plenty of fluids while we are resting. It is important to flush the enemy out, allowing our white blood cells to gain momentum, and once again rule where they have been defeated.

Viruses Don't Give Up

We think we are in the clear as our noses stop running, and our cough becomes less severe. The viruses however, have managed to find a new host. They have attached themselves to food and waste products, and even our beloved animals. Suddenly, in the midst of daily chores, we get exposed to flu viruses that are thriving in the cells of our surroundings.

As we bite into that juicy apple, viruses spread from our hands to the fruit, and into our bodies, preparing to multiply. Then, when we least expect it, they mutate and go through gradual changes. They develop special powers with these mutations, as they jump from animal host to human host. Where once they could only infect the specific species they attached to, now they are able to adapt to a new host, and continue spreading like never before.

The Spread of Viral Invaders

Flu viruses spread through the air. They are carried from host to host when people who are infected cough, sneeze or even talk to each other. Viruses also land on

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