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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 include the common cold , gastroenteritis , COVID-19 , the flu , and rabies .
A viral infection does not always cause disease. A viral infection simply involves viral replication in the host, but disease is the damage caused by viral multiplication. [5] An individual who has a viral infection but does not display disease symptoms is known as a carrier. [17] Mechanisms by which viruses cause damage and disease to host cells
This is a list of infectious diseases arranged by name, along with the infectious agents that cause them, the vaccines that can prevent or cure them when they exist and their current status. Some on the list are vaccine-preventable diseases .
The virus that causes AIDS, for example, crossed over from chimpanzees. And many experts believe the virus that caused the COVID-19 pandemic flowed from bats. But, as a new study shows, this ...
There have been various major infectious diseases with high prevalence worldwide, but they are currently not listed in the above table as epidemics/pandemics due to the lack of definite data, such as time span and death toll. An Ethiopian child with malaria, a disease with an annual death rate of 619,000 as of 2021. [18]
An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection. Infections can be caused by a wide range of pathogens , most prominently bacteria and viruses . [ 2 ]
Co-existing diseases can but don't necessarily contribute to death [56] to various degrees in various ways. In some cases, comorbidities can be major causes with complex underlying mechanisms, and a range of comorbidities can be present once. [57] Pandemics [58] [59] and infectious diseases or epidemics
Doctors in the U.S. report an uptick in enteroviruses in babies. The summer illnesses come as the WHO reports on dozen cases of deadly viral sepsis in babies in Europe.