A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea.
Since Dmitri Ivanovsky's 1892 article describing a non-bacterial pathogen infecting ******* plants and the discovery of the ******* mosaic virus by Martinus Beijerinck in 1898, more than 9,000 virus species have been described in detail of the millions of types of viruses in the environment. Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity. The study of viruses is known as virology, a subspeciality of microbiology.
When infected, a host cell is often forced to rapidly produce thousands of copies of the original virus. When not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent particles, or virions, consisting of (i) the genetic material, i.e., long molecules of DNA or RNA that encode the structure of the proteins by which the virus acts; (ii) a protein coat, the capsid, which surrounds and protects the genetic material; and in some cases (iii) an outside envelope of lipids. The shapes of these virus particles range from simple helical and icosahedral forms to more complex structures. Most virus species have virions too small to be seen with an optical microscope and are one-hundredth the size of most bacteria.
The origins of viruses in the evolutionary history of life are unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria. In evolution, viruses are an important means of horizontal gene transfer, which increases genetic diversity in a way analogous to sexual reproduction. Viruses are considered by some biologists to be a life form, because they carry genetic material, reproduce, and evolve through natural selection, although they lack the key characteristics, such as cell structure, that are generally considered necessary criteria for defining life. Because they possess some but not all such qualities, viruses have been described as "organisms at the edge of life", and as replicators.Viruses spread in many ways. One transmission pathway is through disease-bearing organisms known as vectors: for example, viruses are often transmitted from plant to plant by insects that feed on plant sap, such as aphids; and viruses in animals can be carried by blood-sucking insects. Many viruses, including influenza viruses, SARS-CoV-2, chickenpox, smallpox, and measles, spread in the air by coughing and sneezing. Norovirus and rotavirus, common causes of viral gastroenteritis, are transmitted by the faecal–oral route, passed by hand-to-mouth contact or in food or water. The infectious dose of norovirus required to produce infection in humans is fewer than 100 particles. HIV is one of several viruses transmitted through sexual contact and by exposure to infected blood. The variety of host cells that a virus can infect is called its "host range". This can be narrow, meaning a virus is capable of infecting few species, or broad, meaning it is capable of infecting many.Viral infections in animals provoke an immune response that usually eliminates the infecting virus. Immune responses can also be produced by vaccines, which confer an artificially acquired immunity to the specific viral infection. Some viruses, including those that cause HIV/AIDS, HPV infection, and viral hepatitis, evade these immune responses and result in chronic infections. Several classes of antiviral drugs have been developed.
help mga idol! nag try ako mag dl ng games sa pc biglang na viruz pc ko ng zpps na extension. mga files ko ayaw gumana. baka may makakatulong po. salamat!
Help po mga master,cellphone ng friend
ko bigla nalang po naging ganito
Ayaw naman ma Factory reset,,
Samsung Galaxy A52
Wala naman po sya Grab account,
Maraming salamat po sa mga tutulong
Mga ka-PHC pa help naman.. Nag ka virus yung PC ng kuya(Pinsan) ko.
Reason: Nag install kasi siya ng application kasi nag hahanap siya ng cr4ck para sa AUTOCAD 2019, tapos mga ilang minutes may mga unwanted apps na nag install nang kusa tapos nung tinignan namin ung mga files niya biglang...
The dodgy ads were concealed in free-to-download games and cameras apps, and were all available on the official Google Play Store.
Dodgy Android apps would use sneaky ads to earn money for crooks – while ruining your phone
Collectively the apps had been installed on millions of devices –...
Yung Flash Drive ko
Nagkakaroon ng shortcut lahat ng files sa loob pero hindi yung flash drive
Merong batch file na Files pangalan kahit i format ko hindi natatanggal hindi ko na ma open nga files ko. Help please?
Ano po magandang gawin oag laging nag oopen data at WiFi. Tapos install ng install mga apk. Napakarami na :( nag block ako ng apk pero may nag popop out padin na notif kung iinstall ko ba. Please patulong pooo.
Kakapost lng ng promo na to naka spoil pa bkt napost agad sa FB?
Ano ba mga stablished kayo pero asan loyality nyo ha? Gusto nyo na din magpafamous lng!
Kung oo iPm nyo lng ako bbgyan ko kayo ng auto liker!
Mga CANCER ng lipunan! Pwe!! Wla nakong ilalabas ditong tricks bugs!
May virus po ang laptop namin ewan ko lang po kung anung klaseng virus
Hinack nya po ang pc ko
Di ko po maopen ang antivirus
At biglang may lumabas na CMD
At nakausap ko sa maliit na cmd ang häçker
Ang sabi nya Good Night
At sunod sunod na
Watch
Watch
Watch
At nakita ko ang sarili kong picture...
Hala ! Beware kayo sa mga ibang ehi dito kasi kanina yung may mga bago na post lng na ehi dinownload ko tapus wla palang link yun tsaka nag log lng yung cellphone ko tas lumabas yung notifications ng Bluetooth nag taka ako kasi hindi ko naman ini on yung Bluetooth ko tas inioff ko nag shutdown...
pahelp naman mga ka phc yung phone ko kase nag ddl na apps at install kahit di ko naman ginagalaw nka off naman unknown sources ko..nag hard reset nako nabalik pa din basta connected ako sa wifi..salamat po sa mga sasagot..gb
Pa help nman, ung phone kong cherry mobile touch 3g may monkey/sê×ÿ virus., gusto ko sana palitan ng ibang ROM at pwede bng wag ng ikonek sa pc pg ginawa un? syaka kailangan ko pa ba i-back.up ung ROM na may virus?
Suggest na rin kayo ng rom na compatible sa cherry mobile touch 3g ko marami...