Virus attacks again

The most feared one these days

The H5N1 avian influenza virus, commonly known as "bird flu," is a highly contagious and deadly disease in poultry. So far, its spread to humans has been limited, with 177 documented severe infections, and nearly 100 deaths in Indonesia, Vietnam, Thailand, Cambodia, China, Iraq, and Turkey as of March 14, 2006, according to the World Health Organization.

Ebola hemorrhagic fever (Ebola HF) is a severe, often-fatal disease in humans and nonhuman primates (monkeys, gorillas, and chimpanzees) that has appeared sporadically since its initial recognition in 1976.

The disease is caused by infection with Ebola virus, named after a river in the Democratic Republic of the Congo (formerly Zaire) in Africa, where it was first recognized. The virus is one of two members of a family of RNA viruses called the Filoviridae. There are four identified subtypes of Ebola virus. Three of the four have caused disease in humans: Ebola-Zaire, Ebola-Sudan, and Ebola-Ivory Coast. The fourth, Ebola-Reston, has caused disease in nonhuman primates, but not in humans.

Viruses and bacteria
Reviewed by Dr Dan Rutherford, GP

What are viruses?

Viruses are too small to be seen by the naked eye. They can't multiply on their own, so they have to invade a 'host' cell and take over its machinery in order to be able to make more virus particles.

Viruses consist of genetic materials (DNA or RNA) surrounded by a protective coat of protein. They are capable of latching onto cells and getting inside them.

The cells of the mucous membranes, such as those lining the respiratory passages that we breathe through, are particularly open to virus attacks because they are not covered by protective skin.

What are bacteria?

Bacteria are organisms made up of just one cell. They are capable of multiplying by themselves, as they have the power to divide. Their shapes vary, and doctors use these characteristics to separate them into groups.

Bacteria exist everywhere, inside and on our bodies. Most of them are completely harmless and some of them are very useful. But some bacteria can cause diseases, either because they end up in the wrong place in the body, or simply because they are 'designed' to invade us.

How are infections with viruses and bacteria spread?

Viral and bacterial infections are both spread in basically the same ways.

* A person with a cold can spread the infection by coughing and/or sneezing.

* Bacteria or viruses can be passed on by touching or shaking hands with another person.

* Touching food with dirty hands will also allow viruses or bacteria from the intestine to spread.

* Body fluids such as blood, saliva and semen can contain the infecting organisms and transmission of such fluids, for example by injection or sexual contact, is important, particularly for viral infections like hepatitis or AIDS.

How to avoid infection

* Wash your hands thoroughly (often one of the best ways to avoid catching a cold).

* Shaking hands with someone who has a cold is risky, so avoid rubbing your eyes or nose afterwards.

* Food should be cooked or cooled down as quickly as possible.

* Vegetables and meat must be stored separately and prepared on separate chopping boards.

* Meat should preferably be served well-done.

* Remember that food with these invisible organisms does not necessarily smell bad.

* Some organisms are killed as the food is cooked, but they can still leave toxic substances that may cause diarrhoea and vomiting.

* The use of condoms during sexual intercourse reduces the likelihood of spreading sexually transmitted diseases.

PNEUMONIA

Pneumonia is a general term that refers to an infection of the lungs, which can be caused by a variety of microorganisms, including viruses, bacteria, fungi, and parasites.

Often pneumonia begins after an upper respiratory tract infection (an infection of the nose and throat). When this happens, symptoms of pneumonia begin after 2 or 3 days of a cold or sore throat.
Signs and Symptoms

Symptoms of pneumonia vary, depending on the age of the child and the cause of the pneumonia. Some common symptoms include:

* fever
* chills
* cough
* unusually rapid breathing
* breathing with grunting or wheezing sounds
* labored breathing that makes a child's rib muscles retract (when muscles under the rib cage or between ribs draw inward with each breath)
* vomiting
* chest pain
* abdominal pain
* decreased activity
* loss of appetite (in older children) or poor feeding (in infants)
* in extreme cases, bluish or gray color of the lips and fingernails

Sometimes a child's only symptom is rapid breathing. Sometimes when the pneumonia is in the lower part of the lungs near the abdomen, there may be no breathing problems at all, but there may be fever and abdominal pain or vomiting.

When pneumonia is caused by bacteria, an infected child usually becomes sick relatively quickly and experiences the sudden onset of high fever and unusually rapid breathing. When pneumonia is caused by viruses, symptoms tend to appear more gradually and are often less severe than in bacterial pneumonia. Wheezing may be more common in viral pneumonia.

Some types of pneumonia cause symptoms that give important clues about which germ is causing the illness. For example, in older children and adolescents, pneumonia due to Mycoplasma (also called walking pneumonia) is notorious for causing a sore throat and headache in addition to the usual symptoms of pneumonia.

In infants, pneumonia due to chlamydia may cause conjunctivitis (pinkeye) with only mild illness and no fever. When pneumonia is due to whooping cough (pertussis), the child may have long coughing spells, turn blue from lack of air, or make a classic "whoop" sound when trying to take a breath.
Description

Pneumonia is a lung infection that can be caused by different types of germs, including bacteria, viruses, fungi, and parasites. Although different types of pneumonia tend to affect children in different age groups, pneumonia is most commonly caused by viruses. Some viruses that cause pneumonia are adenoviruses, rhinovirus, influenza virus (flu), respiratory syncytial virus (RSV), and parainfluenza virus (the virus that causes croup).
Incubation

The incubation period for pneumonia varies, depending on the type of virus or bacteria causing the infection. Some common incubation periods are: respiratory syncytial virus, 4 to 6 days; influenza, 18 to 72 hours.
Duration

With treatment, most types of bacterial pneumonia can be cured within 1 to 2 weeks. Viral pneumonia may last longer. Mycoplasmal pneumonia may take 4 to 6 weeks to resolve completely.
Contagiousness

The viruses and bacteria that cause pneumonia are contagious and are usually found in fluid from the mouth or nose of an infected person. Illness can spread when an infected person coughs or sneezes on a person, by sharing drinking glasses and eating utensils, and when a person touches the used tissues or handkerchiefs of an infected person.
Prevention

There are vaccines to prevent infections by viruses or bacteria that cause some types of pneumonia.

Children usually receive routine immunizations against Haemophilus influenzae and pertussis (whooping cough) beginning at 2 months of age. (The pertussis immunization is the "P" part of the routine DTaP injection.) Vaccines are now also given against the pneumococcus organism (PCV), a common cause of bacterial pneumonia.

Children with chronic illnesses, who are at special risk for other types of pneumonia, may receive additional vaccines or protective immune medication. The flu vaccine is strongly recommended for children with chronic illnesses such as chronic heart or lung disorders or asthma, as well as otherwise healthy children.

Because they are at higher risk for serious complications, infants who were born prematurely may be given treatments that temporarily protect against RSV, which can lead to pneumonia in younger children.

Doctors may give prophylactic (disease-preventing) antibiotics to prevent pneumonia in children who have been exposed to someone with certain types of pneumonia, such as pertussis. Children with HIV infection may also receive prophylactic antibiotics to prevent pneumonia caused by Pneumocystis carinii.

Antiviral medication is now available, too, and can be used to prevent some types of viral pneumonia or to make symptoms less severe.

In addition, regular tuberculosis screening is performed yearly in some high-risk areas because early detection will prevent active tuberculosis infection including pneumonia.

In general, pneumonia is not contagious, but the upper respiratory viruses that lead to it are, so it is best to keep your child away from anyone who has an upper respiratory tract infection. If someone in your home has a respiratory infection or throat infection, keep his or her drinking glass and eating utensils separate from those of other family members, and wash your hands frequently, especially if you are handling used tissues or dirty handkerchiefs.
When to Call Your Child's Doctor

Call your child's doctor immediately if your child has any of the signs and symptoms of pneumonia, but especially if your child:

* is having trouble breathing or is breathing abnormally fast
* has a bluish or gray color to the fingernails or lips
* has a fever of 102 degrees Fahrenheit (38.9 degrees Celsius), or above 100.4 degrees Fahrenheit (38 degrees Celsius) in infants under 6 months of age

Professional Treatment

Doctors usually make the diagnosis of pneumonia after a physical examination. The doctor may possibly use a chest X-ray, blood tests, and (sometimes) bacterial cultures of mucus produced by coughing when making a diagnosis.

In most cases, pneumonia can be treated with oral antibiotics given to your child at home. The type of antibiotic used depends on the type of pneumonia.

Children may be hospitalized for treatment if they have pneumonia caused by pertussis or other bacterial pneumonia that causes high fevers and respiratory distress. They may also be hospitalized if supplemental oxygen is needed, if they have lung infections that may have spread into the bloodstream, if they have chronic illnesses that affect the immune system, if they are vomiting so much that they cannot take medicine by mouth, or if they have recurrent episodes of pneumonia.
Home Treatment

If your child's doctor has prescribed antibiotics for bacterial pneumonia, give the medicine on schedule for as long as the doctor directs. This will help your child recover faster and will decrease the chance that infection will spread to other household members.

Don't force a child who's not feeling well to eat, but encourage your child to drink fluids, especially if fever is present. Ask your child's doctor before you use a medicine to treat your child's cough because cough suppressants stop the lungs from clearing mucus, which may not be helpful in some types of pneumonia.

If your child has chest pain, try a heating pad or warm compress on the chest area. Take your child's temperature at least once each morning and each evening, and call the doctor if it goes above 102 degrees Fahrenheit (38.9 degrees Celsius) in an older infant or child, or above 100.4 degrees Fahrenheit (38 degrees Celsius) in an infant under 6 months of age.

Check your child's lips and fingernails to make sure that they are rosy and pink, not bluish or gray, which is a sign that your child's lungs are not getting enough oxygen.