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Some viruses can "hide" within a cell, which may mean that they evade the host cell defenses or immune system and may increase the long-term "success" of the virus. This hiding is deemed latency. During this time, the virus does not produce any progeny, it remains inactive until external stimuli—such as light or stress—prompts it to activate.
The respiratory syncytial virus , on the other hand, is contracted by direct contact and airborne droplets. It then replicates in the nose and throat before spreading to the lower respiratory tract. [48] RSV does cause epithelium damage. [48] Human parainfluenza virus typically results in inflammation of the nose, throat, and bronchi. [49]
Viruses can cause massive human mortality. The smallpox virus killed an estimated 10 to 15 million people per year until 1967. [3] Smallpox was finally eliminated in 1977 by extinction of the virus through vaccination, and the impact of viruses such as influenza, poliomyelitis and measles are mainly controlled by vaccination. [4]
How the body responds to COVID-19 will vary from one person to the next, and the same goes for the recovery period from the virus.. How long it’ll take to recover from COVID-19 is always going ...
Virus latency (or viral latency) is the ability of a pathogenic virus to lie dormant within a cell, denoted as the lysogenic part of the viral life cycle. [1] A latent viral infection is a type of persistent viral infection which is distinguished from a chronic viral infection.
Influenza A virus subtype H5N1: 455 [235] 2004 Indonesia dengue epidemic 2004 Indonesia: Dengue fever: 658 [236] 2004 Sudan Ebola outbreak 2004 Sudan: Ebola: 7 [237] 2004–2005 Angola Marburg virus outbreak 2004–2005 Angola: Marburg virus: 227 [229] 2005 dengue outbreak in Singapore: 2005 Singapore: Dengue fever: 27 [238] 2006 Luanda cholera ...
The diversity of human viruses is vast and continually expanding. As of now, there are 219 known species of viruses that can infect humans. This number continues to grow with three to four new species being discovered every year. The human virome is not stable and may change over time. In fact, new viruses are discovered constantly.
[13]: 802 Plant viruses cannot infect humans and other animals because they can reproduce only in living plant cells. [13]: 799–807 Originally from Peru, the potato has become a staple crop worldwide. [180] The potato virus Y causes disease in potatoes and related species including tomatoes and peppers. In the 1980s, this virus acquired ...