Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Infectious diseases:
Some of you may have heard about the great bubonic plague, a fatal disease of the blood, spread by fleas and respiratory secretions. It occurred in epidemic proportions throughout most of Europe from thirteenth to nineteenth century. A major outbreak of plague in India occurred in 1896 and lasted for fifteen years. It swept through villages and towns and killed over eight million people. It seems that such diseases were common in ancient times. Increased trade and commerce and resultant human traffic made them reach new places all over the world. Similarly, diseases such as small pox, measles, influenza and cholera spread easily from one person to another, and from one area to another.
The reason for the spread of these diseases, and many others, was not known till the nineteenth century. Till then, such diseases always left people struck with terror because their causes were shrouded in mystery. Due to ignorance, demons and evil spirits were blamed for causing these diseases. In India, it was believed that these diseases weie a punishment from angry deities. A new Goddess was created and held responsible for each disease. For example "Stela Ma" is said to cause small pox. People worshipped her to get cured from this disease. It would be interesting to note here that small pox has been eradicated from this planet due to a planned world-wide vaccination campaign. Plague outbreaks do not occur any more.
The poem given in the margin which children often sing while playing, is jointly sung at a memorial service outside the village Eyam in England to pay homage to the townsfolk who gave their lives three centuries ago to save others from the disease. These people got affected by plague. In order to stop the spread of disease they confined themselves in their village to save others. The ring of rosies refers to tbe rose-shaped splotches on a plague victim. Posies were little flowers used to ward off the evil spirit. And Achoo! means sneezing which accompanied the disease. The last line means that they all died. You must have experienced that if somebody in the family is suffering from a cough or cold you often catch it. Do you know why?
Because these diseases are caused by germs or "microbes" which can go from one person to another. "Microbes" means minute organisms or germs. They are so small that we cannot see them with the naked eye. Some can be seen with the help of an ordinary microscope while others are smaller still and can be seen only under very special microscopes. Certain infectious diseases are caused by worms. We will also discuss how they spread from one perso- another.
Which type of ripple marks would you expect to find on the floor of a standing body of waterion..
What is Dry manure Dry manure though contains 80 percent carbon, yet it is considered primarily as a nitrogen fertilizer and, to a lesser extent, one of potassium. Losses of nu
In hydraulic machines a liquid that has filled a pipe is pushed at one end of the pipe. The liquid then pushes a machine part located at other end of the pipe. Why isn''t gas used
The effect of soil on growing things Get samples of a fertile soil from a flower or vegetable garden, from a wood, from a place where a cellar is life form dug, from a sandy pl
Brain: The centre piece of the nervous system is the brain which IS possibly the most organised form of matter known. It is unlike any other organ of the body, as ~t alon
Determine about the soil humus The organic constituents (organic colloids) are due to mainly the plants and partly the animals. They form only a small fraction and get transfo
Requirements Autoclave Microbial cultures - liquid/solid Disinfectant Spatula Disposable bags
The hydrogenation of cyclohexene in the liquid phase has been investigated in a laboratory reactor in the temperature range from 25°C to 30°C. The catalyst (Pt) is suspended in the
QUESTION 1 (a) Differentiate between the central nervous system and the peripheral nervous system (b) Elaborate on the functions of the hindbrain structures QUESTION 2
Biological Basis of Aggression: Studies show that mild electrical stimulation of a specific region of the hypothalamus - produces aggressive behaviour in animals. When a cat'
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd