First of all we should try and explain what influenza (flu) is. There are three main types: A, B and C, with B and C only infecting humans and influenza A being able to infect humans, animals and birds. The surface of each influenza A virus contains two types of protein, neuraminidase (N), of which there are nine types, and haemagglutinin (H), of which there are sixteen types. Consequently, there are lots of sub-strains of the influenza A virus and they are given names depending on the type of proteins found on the surface. Examples of these sub-strains could be H1N1, H1N2 and H2N3.

Another characteristic of the A strain is that it has the ability to produce new strains – in other words, mutate. It is as these new strains occur that new types of flu are discovered.

Bird flu is a strain of influenza A that affects birds, of which all species can be affected. Whereas wild birds can carry the disease when they migrate, they don’t usually become ill with it whereas poultry birds like turkeys and chickens do become ill. The virus spreads easily between these birds.

Bird Flu

It is the H5N1 virus that is causing all the problems with humans at the moment. This strain has affected birds for almost half a century, but it mutated back in 1997 in the Far East and spread to humans. As of yet this strain of the virus cannot be transferred from human to human, only from bird to bird or sometime bird to human.

The testicles are found within the scrotum which is a loose sac of skin hanging down behind the penis.  The function of the testicles is to produce sperm and the male sex hormone testosterone.  Most of the time any lumps or swelling within the testicles are benign but it is natural for people to worry when they have found a lump.

Testicular torsion results in swelling of the testicles if the testicle has become twisted.  This interrupts blood flow and causes a large tender distension.  It often happens in developing boys who are experiencing puberty but has also been know to happen in men in their 20’s although it is quite rare.  Testicular torsion is a medical emergency due to the fact that it needs to be rectified by surgery within 6 hours or there is a risk that the testicle will be lost.

Symptoms of testicular torsion include nausea; vomiting; swelling of the scrotum; fever; abdominal pain; the need to urinate often; and, excruciating pain in one testicle.  The cause of testicular torsion results from a spermatic cord that is too long.  The spermatic cord is where the testicles hang from and in some boys this cord is too long leading to increased movement of the testicle which means the cord becoming twisted.  If it twists too much it will cut off the blood supply and the testicle will die.  Testicular torsion can sometimes just happen for no reason at all or it can be the result of strenuous exercise or other physical activity.

An ultrasound scan can be done to confirm suspicion of testicular torsion. Surgery needs to take place almost immediately to save the testicle.  The surgeon will have to cut the scrotum and untwist the cord.  He will then sew the cord to the scrotum to prevent this happening again.

Testicular Torsion

HIV, or human immunodeficiency virus, is the virus which can lead to AIDS. There are many ways to contract this virus, with the most common being through unprotected sex and the sharing of needles.

People who are infected with HIV may initially not realize there is anything wrong with them as they do not show any symptoms. Nevertheless, some people tend to develop some flu like symptoms which can last for several weeks. Some of these symptoms may include fever, tiredness, loss of appetite, aching muscles and joints, rashes and swollen lymph glands.

HIV Virus Structure

When the virus enters the body, it takes residence in white blood cells that are known as CD4 lymphocytes. The virus takes total control of these cells and starts producing billions of replicas of itself every day.

Once infection of HIV occurs, the body starts to attack the virus and because of this the virus cannot make any copies of itself. This in turn leads to a false sense of wellness as although one would still have HIV, the infected person will begin to look and feel better. Unfortunately, during this period the virus is still attacking the lymph nodes, which are the body’s immune system center.

During the course of ten to fifteen years, the HIV manages to kill so many of the CD4 cells that the body no longer has the ability to fight off infections. Once the CD4 cell count drops below a certain number (200 or lower per mL – the average is 600 to 1000) the sufferer is classed as having AIDS (acquired immunodeficiency syndrome). Once a person has AIDS, the risk of infection form almost anything can cause fatal complications.

HIV Virus Cycle