Editing 2238: Flu Shot
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* '''{{w|Rabies}}''' is a near invariably fatal viral disease that causes brain inflammation, which in turn causes symptoms including aggression, fear of water, and violent uncontrollable limb movements. It can be carried by almost any vertebrate animal, but bats, raccoons, and wild dogs are the stereotypical carriers. There is a rabies vaccine, but it is generally only administered to pets and to humans who work extensively with animals or travel to regions with an elevated risk of contracting rabies. The rabies vaccine is also effective to prevent rabies after exposure, but only if administered before the victim starts showing symptoms. | * '''{{w|Rabies}}''' is a near invariably fatal viral disease that causes brain inflammation, which in turn causes symptoms including aggression, fear of water, and violent uncontrollable limb movements. It can be carried by almost any vertebrate animal, but bats, raccoons, and wild dogs are the stereotypical carriers. There is a rabies vaccine, but it is generally only administered to pets and to humans who work extensively with animals or travel to regions with an elevated risk of contracting rabies. The rabies vaccine is also effective to prevent rabies after exposure, but only if administered before the victim starts showing symptoms. | ||
| − | * '''{{w|Poison ivy}}''' is a vine | + | * '''{{w|Poison ivy}}''' is a vine which produces an oil, {{w|urushiol}}, which chemically reacts with membrane proteins on the skin cells it contacts, tricking the immune system into attacking those cells, causing an itchy, irritating rash. Some people are not affected by poison ivy, but as it is an allergic reaction, people often become more sensitive to poison ivy upon repeated exposure. There is no known vaccine or other permanent preventative treatment against urushiol sensitivity, although there are several creams that can be applied in advance of expected poison ivy exposure to reduce the risk of contacting the chemical. |
* '''{{w|Sunburn}}''' is caused by exposing the skin to high levels of ultraviolet radiation, as found in sunlight. This can increase the risk of skin cancer later in life. As ultraviolet radiation is a form of electromagnetic energy, it cannot be prevented by vaccination, but the use of sunscreen with a high SPF ({{w|sun protection factor}}) can provide protection for a few hours. | * '''{{w|Sunburn}}''' is caused by exposing the skin to high levels of ultraviolet radiation, as found in sunlight. This can increase the risk of skin cancer later in life. As ultraviolet radiation is a form of electromagnetic energy, it cannot be prevented by vaccination, but the use of sunscreen with a high SPF ({{w|sun protection factor}}) can provide protection for a few hours. | ||
* '''{{w|Snake venom}}''' is not one single compound, but several proteins and molecules produced by venomous snakes to inject into prey. Different snakes' venoms have different effects, so there is no single vaccine or antivenom for all snake bites, but {{w|antivenom}}s are produced by a process similar to vaccination. Small doses of venom are injected into host animals, such as horses, to provoke an immune response; the resulting antibodies are then stored to be injected into snakebite victims, where they will bind up and inactivate the toxic proteins and mark them for disposal by the immune system. Antivenom is more effective the sooner it is administered; for venomous snakes in North America, it is generally recommended to be treated within six hours of being envenomated. | * '''{{w|Snake venom}}''' is not one single compound, but several proteins and molecules produced by venomous snakes to inject into prey. Different snakes' venoms have different effects, so there is no single vaccine or antivenom for all snake bites, but {{w|antivenom}}s are produced by a process similar to vaccination. Small doses of venom are injected into host animals, such as horses, to provoke an immune response; the resulting antibodies are then stored to be injected into snakebite victims, where they will bind up and inactivate the toxic proteins and mark them for disposal by the immune system. Antivenom is more effective the sooner it is administered; for venomous snakes in North America, it is generally recommended to be treated within six hours of being envenomated. | ||
* '''{{w|Raw water}}''' may be contaminated by bacteria, protozoa, parasites, and chemical pollutants. Boiling water will typically kill off most biological contaminants, preventing water-borne diseases such as {{w|cholera}}, {{w|dysentery}}, and {{w|giardiasis}}. Some of these diseases can be prevented by vaccines, but because there are so many microscopic life-forms in water, it is not possible to vaccinate against all of them. | * '''{{w|Raw water}}''' may be contaminated by bacteria, protozoa, parasites, and chemical pollutants. Boiling water will typically kill off most biological contaminants, preventing water-borne diseases such as {{w|cholera}}, {{w|dysentery}}, and {{w|giardiasis}}. Some of these diseases can be prevented by vaccines, but because there are so many microscopic life-forms in water, it is not possible to vaccinate against all of them. | ||
| − | * '''{{w|Computer virus|Computer viruses}}''' are computer programs that | + | * '''{{w|Computer virus|Computer viruses}}''' are computer programs that now usually spread through networks via infected devices, attachments, and websites (early computer viruses were often spread by floppy diskettes). They can cause harm directly by taking up computer cycles and network bandwidth, but nowadays they often perform other tasks for their creators, such as exfiltrating financial information or encrypting files and demanding a ransom for the keys. Computer viruses can be recognized and blocked or deleted by antivirus software that scans incoming files and links against known computer virus patterns, which is analogous to vaccination, but there is no vaccine that can be administered to Megan which would protect her computer. |
** Megan specifically mentions clicking on links that have "weird Unicode in them"; this may be referring to an {{w|IDN homograph attack}}, in which attackers register domain names that use Unicode characters that resemble ASCII characters to trick users into thinking they are visiting a website belonging to a trusted party. For example, an attacker could register a website with the URL "xkсd.com", in which the Latin letter "c" is replaced by the Cyrillic letter ''es'' (с), and then send emails to trick users into visiting that site and attempting to log in. The attacker can then attempt to use the supplied passwords on more important websites, as in [[792: Password Reuse]]. | ** Megan specifically mentions clicking on links that have "weird Unicode in them"; this may be referring to an {{w|IDN homograph attack}}, in which attackers register domain names that use Unicode characters that resemble ASCII characters to trick users into thinking they are visiting a website belonging to a trusted party. For example, an attacker could register a website with the URL "xkсd.com", in which the Latin letter "c" is replaced by the Cyrillic letter ''es'' (с), and then send emails to trick users into visiting that site and attempting to log in. The attacker can then attempt to use the supplied passwords on more important websites, as in [[792: Password Reuse]]. | ||
