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Types of communicable diseases

Comments (2) | Wednesday, February 24, 2010

types of communicable diseases

A communicable disease is one in which the causative organism is carried from one person to another either directly or indirectly. Communicable diseases are classified into following types :

1. Viral Diseases
Examples : influenza, small pox, chicken pox, etc.

2. Rickettisial Diseases
These are caused by rickettsias (the obligate nitracellular parasites). The name Rickettsia was given after the name of American Scientist Rickettis ( 1871-1910 ). Examples : Rocky Mountain Spotted fever, trench fever, Q fever and typhus fever.

3. Disease caused by Chlamydiae
Chlamydiae occupy a position intermediate between Rickettsiae and virus. They resemble rickettsiae but differ from them significantly by possessing a unique, obligatory intracellular developmental cycle. Examples : Chlamydia trachomatis stains have been classified by neutralisation and immunofluorescence tests into 15 serotypes - A, B, Ba, C, D, E, F, G, H, I, J, K, L types, other disease caused by chlamydiae are lymphogranulosa, venreum and psittacosis.

4. Mycoplasmal Diseases
Because mycoplasmae resemble to the organism causing pleuroneumonia, they were called "pleuropneumonia like organisms " or PPLO. The causative agent of bovine pleuropneumonia was first isolated by Nocard and Roux.

5. Bacterial Diseases
Examples : Cholera, typhoid, syphilis, etc.

6. Protozoan Diseases
Examples : Amoebiasis, malaria, kala-azar, oriental sore, sleeping sickness, etc.

7. Helminth Diseases ( flat worms and round worms )
Examples : taeniasis, schistosomiasis, liver rot-caused by flat worms, and ascariasis, filariasis, enterobiasis, trichinosis, hookworm disease and guinea worm disease caused by roundworms.

8. Fungal Diseases
These are caused by fungi. Examples : Ringworm, athlete's foot, etc.


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Prevention of bird flu

Comments (2) | Tuesday, February 23, 2010

prevention of bird flu
Bird flu, also termed as ' avian influenza ' has become concerning disease in these recent years. As the name clears, this flu attacks different species of birds , especially includes chickens, ducks and geese.In total , there are about 16 types of bird flu virus , however, one that is concerning is deadly H5N1 strain. At present, worldwide, about 9,000 deaths has been resulted due to the bird flu, and the deaths of chickens has no limit at all.

Primarily, prevention should be adopted by the one who works in poultry. One should must use masks and gloves for his protection while working in poultry.Bird flu should be controlled starting from farm. Farm animals should be kept well fenced and we should control their link with wild animals as well as other farms. If any sorts of symptoms of flu is found in any bird, then it should be isolated from the group and should be kept separate for investigation. Careful dealing with different nasal and faeceal discharges while working in poultry should be done.

If we have any bird as pet, then we should be careful in this case. It should be kept caged, and control its way out to outdoor. AVMC ( The American Veterinarian Medical Association ) suggests not to allow our cat to escape here and there outside, for prevention from bird flu and other diseases as well.

Prevention while eating poultry items is a must for preventing bird flu. Several preventive measures should be taken in considerations while handling and eating poultry items. Separate dishes and knives should be used for poultry and vegetables and should be well washed after they are used. Cooking temperature should must exceed 70°C. Eggs also carry bird flu. So, eggs should be well washed before they are cooked. Buying cracked eggs should be strictly avoided. Several of people take frozen meat who should well know that freezing the meat does not kill the virus at all.

Different vaccines are available for bird flu. Tamiflu prevents virus from escaping its host cell. However , these medication are not well effective and treatment can't be assured. So, if we can , prevention is far better than searching its cure.


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Different viral Hepatitis

Comments (4) | Monday, February 22, 2010

different viral hepatitis
Hepatitis is defined as the infection of liver by virus ( expecially A, B, C , D, E virus ). It is self-limiting disease.

Some facts about different viral Hepatitis
> Among the Hepatitis A, B, C, D, E : Hepatitis B is DNA virus , rest are RNA virus.
> Vaccine and Immunoglobulin are present for Hepatitis B and C.
> Treatment: drugs are present for Hepatitis B and C.
> Fecal - oral transmission is present in Hepatitis A and E.
> Vertical transmission ( Mother to foetus ) is present in Hepatitis B and D.
> Hepatitis A and E are also known as infective hepatitis.
> Chronic hepatitis if infected for >6 months.
> Hepatitis B and C may cause liver abscess, liver cirrhosis, and liver cancer.
> Hepatitis C is silent killer, more chronic carrier stage.

Hepatitis A / traveller's Hepatitis
Its agent is hepatitis a virus and reservoir in humans is Asymptomatic or symptomatic. It is transmitted by fecal oral route and sexually in homosexual men by oral - anal contact.Incubation period for this Hepatitis is 15 - 45 days. Control measure for this Hepatitis includes boiling water, flocculation, filtration, and adequate chlorination, hand washing, proper sanitation.

Hepatitis E
This Hepatitis causes self-limiting viral illness with mortality ( 0.5 - 4% ) especially in pregnant women ( liver failure ). Pregnancy and Hepatitis E results abortions, IUD , high perinatal morbidity and mortality.

Hepatitis B

This hepatitis is transmitted by parental, perinatal, sexual and and horizontal childhood. Incubation period is 45 days to 180 days. Its clinical feature is similar to Hepatitis A and is acute self timing condition but may go into carrier stage / acute hepatic failure.


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Concept of disease control

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concept of disease control
Disease Control
Disease control mainly focuses on primary and secondary prevention activities. In this , the "agent" is permitted to persist in the community at a level shere it ceases to be public health problem according to the tolerance of the local population.e.g. Malaria control

Disease elimination
It is used to describe the interruption of transmission of disease or reduction of case transmission to a predetermined very low level. e.g.WHO (1991) - TB elimination to 1 case / million population.

Disease eradication
It is often termed as complete " tear out by roots ". It means termination of all transmission of infection by extermination of the infectious agent. It is an absolute process, e.g. small pox eradication.

Monitoring
The performance and analysis of routine movements aimed at detecting changes in the environment or health status of population.

Surveillance

It means to watch over with great attention, authority and often with suspicion. It is the continuous scrutiny of the factors that determine the occurrence and distribution of disease and other condition of all health.


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Concept of disease causation

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There are different theories regarding the concept of disease causation.

1.Germ theory of disease
Louis Pasteur (French bacteriologist) proposed this theory and later confined by Robert Koch. According to this theory , the sole cause of disease are microbes. One to one relationship between causal agent and disease. i.e. 1 organism causes 1 disease.Now , it is found that disease depend upon a number of factors which contributes to its occurrence.

2.Epidemiological triad
It states that disease is caused by interactions between agent, host and environment. Agent is an organism , substance or force presence or lack of which may initiate or may cause the disease to continue e.g. organisms, chemicals, radiation,etc. Similarly host is defined as man or an animal that afford subsistence or lodgement to an infections agents in the environment. Host factors are : age, sex, ethnicity, genetic factors, etc.
3.Multifactorial Causation
It de-emphasize the concept of the disease "agent" and stress multiplicity of interactions between the host and environment (agent is included under the environment). It explains the factors responsible for causation of chronics non-infectious disease like cancer, coronary heart disease.

4.Web of causation
It considers all the predisposing factors of any type and their complex interrelationship with each other. It is usually suited for chronic disease where disease agent is not known, but is the outcome of interaction of multiple factors e.g. Myocardial infarction.


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Cure of HIV AIDS

Comments (8) | Sunday, February 21, 2010

cure of hiv aids
If there is any sorts of anxiety inside us that we have caught hiv aids, due to any means of transmission like unsafe sex with partner who have HIV, or use of infected syringe, genetic transfer, or use of infected blood, then its time for one to visit the family doctor, or a expert on gynecology. Doctors there take different tests of our body, which may include a blood test or any other sorts of test. After performing such tests , it may take a few hours for the result whether there is a presence of HIV in our blood or not.

For performing such sorts of tests, we can walk away to any hospital or clinic around us. One thing we should get relaxed for our test is that the medical personnel keep it confidential about our tests. After performing the tests, result comes out to be either positive or negative. If we can't get the right hospital or clinic around us, then we should contact any hotlines.

Upto present, there is no exactly found cure for HIV AIDS. HIV weakens the immune system of our body which can be slowed down by the use of some drugs or by some clinical treatments. Along with HIV AIDS , there are many HIV assosiated illnesses which can be prevented or cured by some sorts of treatments. Medical personnels and health conscious researchers are on long run to find the exact curing and preventive measures for HIV AIDS, but still all in vain. These all clearly indicates that the success in the discovery of the exact curative measures of HIV AIDS likely is years away.


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Origin of swine flu

Comments (0) | Thursday, February 18, 2010

origin of swine flu

The swine flu, the Swine Influenza A (H1N1) virus, is spreading rapidly around the world. Swine flu is the infection in the respiratory tracts from the hogs. The flu is due to the swine influenza virus (SIV) or S-OIV. In this flu, most people recover well within a week without any treatment while some get serious.

Swine flu was first described in the 1930's. The first outbreak is supposed be around 1918. However, lack of facts about that time, has led question to it. The recognised outbreak was noticed at a US army base in New Jersey in 1976 which resulted in pneumonia in four soldiers among which one of them died.

Another record was in 1988, where a 32 years old lady died the similar swine Flu pneumonia 15 days after she visited a pig exhibition in U.S . Not only that, the health workers who were in charge of infected women developed mild influenza like that of swine flu.

Moving to now days, the outbreak is due to a new strain of sub type H1N1 which was not recognised in pigs previously. During April 2009 , Mexico was captured by swine flu virus where about 1,00o cases in human were detected.Now, about a 100,000 estimated cases and more than 4,000 deaths has been noticed.

The symptoms of flu are similar to the ones that people get in regular seasonal flu. The symptoms includes running nose, cough , fever, sore throat, head ache, fatigue. The disease is transmitted usually from one person to another through sneezing or coughing by the infected ones. Sanitation, use of antiviral drugs and care are the only method to stop the outbreak of disease.


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