Methods by which diseases are transmitted, Biology

Assignment Help:

There are several methods by which a disease-causing organism can be transferred from the reservoir to the host organism.

Direct contact : Disease - causing organism may be transferred immediatly from reservoir or carrier to a healthy person by direct physical contact. This type of transfer is seen in diseases where the disease - causing organism cannot live for a longer time outside the body of human host. Diseases like skin and eye infections are transferred by direct physical contact.

Droplet infection : Droplets of saliva are sprayed out when we cough, sneeze or spit. These salivary droplets from sick person contain the disease-causing organisms. These salivary droplets act as a source of infection for others. Diseases like mumps, influenza, measles, chicken pox, common cold, whooping cough and tuberculosis are transmitted in this manner.

Vehicle borne transmission : In this mode of transmission, the disease-causing organism is transmitted through another living animal which is called as VECTOR. In several cases, the vectors are insects and rats or mice. Diseases such as plague, malaria are transmitted in this manner. Carriers play a very important role in the transmission of a disease. The carrier appears normal but is infected with a disease- causing organism.

Airborne transmission : Air acts as a carrier or vehicle for transferring some of the disease causing organisms. These may be released when a sick person coughs, spits, sneezes. Deseases such as tuberculosis, influenza, chickenpox, measles etc., are transmitted in this manner. 

Unhygienic habits : Eating food without washing hands, eating food or drinking water from unhygienic sources also causes the transfer of disease-causing organisms.


Related Discussions:- Methods by which diseases are transmitted

Explain the life cycle of water, Explain the life cycle of Water? The ...

Explain the life cycle of Water? The water cycle , or hydrologic cycle, is one of the most important processes to living organisms on Earth. Consider the following facts:

Explain the term chemical score, Explain the term Chemical Score? Since...

Explain the term Chemical Score? Since egg proteins contain all essential amino acids in adequate amounts and possess the highest nutritive value among dietary proteins, Block

Determine the stage 1 implant surgery, Determine the stage 1 implant surger...

Determine the stage 1 implant surgery Following stage 1 surgery, prior to commencing on the prosthetic procedures in the conventional loading protocol it is critical that the s

Explain an overview of water soluble vitamins, Explain An Overview of Wate...

Explain An Overview of Water Soluble Vitamins? Vitamins, we already know, are classified by the materials in which they will dissolve. Fat-soluble vitamins -vitamin A, D, E a

What herniation of a disc means, A woman was injured several years ago in a...

A woman was injured several years ago in a car accident and she was diagnosed with a herniated disc. Can you please explain using the correct anatomical terminology what herniation

Define male and female ascaris lumbricoides, Define Male and Female Ascaris...

Define Male and Female Ascaris Lumbricoides? Ascaris lumbricoides unlike most free-living nematodes and a large number of parasites of plants and animals are not tiny or micro

Define the prevention of adverse food reactions, Define the Prevention of A...

Define the Prevention of Adverse Food Reactions? Considering the increasing incidence, cost and morbidity associated with allergic reactions, it is perhaps useful to design pre

What is the function of the iris and of the pupil, What is the function of ...

What is the function of the iris and of the pupil? The iris works like the diaphragm of a photographic camera as it has muscles that contract or relax varying the pupil diamete

Structure of the intestines, Describe the structure of the intestines. How ...

Describe the structure of the intestines. How are they modified to carryout their functions? How does the human intestine compare to the fetal pig?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd