Epidemics often occur due to exposure to an infectious agent or other environmental factors newsink. Exposure to industrial chemicals, radioactive materials, and weather conditions can all cause outbreaks of infectious diseases. In addition to these sources, epidemics can be a result of natural disasters. Exposure to contaminated water and food can also contribute to the spread of infectious diseases. Epidemiology is the scientific study of these events and helps identify the cause.
Epidemics are usually sudden outbreaks of a disease. They typically affect several countries, and last for a few days or weeks. Some outbreaks are normal and expected each year, like influenza. However, when the number of cases exceeds a certain number, authorities consider the disease an epidemic. During an epidemic, an infectious disease spreads quickly and kills many people tinypic. In the 2003 SARS outbreak, for example, over eight hundred people died worldwide.
Epidemics are often caused by sudden and unexpected changes in an environment. They can be caused by a variety of factors, such as a new pathogen, a significant change in the ecology, or unexpected genetic changes in populations. In order to determine whether a certain disease or condition is an epidemic, you should study the population of the area where it occurred.
Viruses are the most common causes of epidemics, but there are also other causes. Viral diseases, such as influenza and measles, can cause large-scale death in a short period of time. Infections with viruses cause an outbreak or epidemic in human populations and can have devastating economic and social effects wikireports. According to the World Health Organization (WHO), the AIDS epidemic killed 35 million people and cost over $1 billion dollars in healthcare costs.
Propagated epidemics can occur in large populations or areas where there is a regular supply of susceptible individuals. They are also more likely to cause secondary person-to-person transmission. Luckily, there are ways to prevent outbreaks and mitigate the risks associated with them. Experts recommend developing a disease surveillance system and social mobilization to prepare for outbreaks keek.
New transportation routes have made it easier for viruses to spread, and they can quickly travel around the world. For example, in 1918, influenza was first identified in Russia and spread rapidly throughout St. Petersburg and throughout Europe. By the end of the year, it had already reached the United States and Canada isaimini. By that time, more than one million people had died from influenza.
Viruses are another common cause of epidemics, especially in developing countries. Viruses can be transmitted from person to person by air or through contaminated surfaces. Viruses that spread through mosquitoes are also important public health concerns. In addition to viral diseases, bacterial pathogens can also be the cause of outbreaks.