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Viral disease. A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [1] Examples are the common cold, gastroenteritis and pneumonia. [2]
It is an attenuated virus, is suitable for individuals aged 6–45 years and protects against all four serotypes of dengue. [55] Due to safety concerns about antibody-dependent enhancement (ADE), it should only be given to individuals who have previously been infected with dengue, in order to protect them from reinfection. [56]
The World Health Organization (WHO) is a leading organisation involved in the global coordination for mitigating the COVID-19 pandemic within the broader United Nations response to the pandemic. On 5 January 2020, the WHO notified the world about a "pneumonia of unknown cause" in China and subsequently began investigating the disease.
The COVID-19 pandemic affected educational systems across the world. [ 1 ] The number of cases of COVID-19 started to rise in March 2020 and many educational institutions and universities underwent closure. Most countries decided to temporarily close the educational institutions in order to reduce the spread of COVID-19.
This is a list of the largest known epidemics and pandemics caused by an infectious disease in humans. Widespread non-communicable diseases such as cardiovascular disease and cancer are not included. An epidemic is the rapid spread of disease to a large number of people in a given population within a short period of time; in meningococcal ...
Cirrhosis due to hepatitis C is a common reason for liver transplantation, [27] though the virus usually (80–90% of cases) recurs afterwards. [ 5 ] [ 105 ] Infection of the graft leads to 10–30% of people developing cirrhosis within five years. [ 106 ]
Pandemic prevention is the organization and management of preventive measures against pandemics. Those include measures to reduce causes of new infectious diseases and measures to prevent outbreaks and epidemics from becoming pandemics. It is not to be mistaken for pandemic preparedness or mitigation (e.g. against COVID-19) which largely seek ...
A PNAS report in September 2020 confirmed that the virus is much more dangerous for the elderly than the young, noting that about 70% of all U.S. COVID-19 deaths had occurred to those over the age of 70. [94] As of early August 2020, among the 45 countries that had over 50,000 cases, the U.S. had the eighth highest number of deaths per-capita.