Question: In what year did the word "viral" come about?
About the article "Virus", section "Etymology".

Candidate passages:
An electronics manufacture is about to launch a new video console and wants to maximize new product potential.
In advance of the launch, Viral Marketing Research is used to compare the relative ROI of several strategies of among high SNP respondents within the target audience.
Results help the manufacturer maximize sales by identifying "what needs to be communicated" and "through which media" (e.g., print ads, Internet videos, texting, television).
A pharmaceutical company has developed a new drug for an existing drug category and needs to build brand recognition.
Viral Marketing Research could be conducted among physicians or patients to identify which communication strategies are most likely to be spread by word-of-mouth, and which are likely to induce physicians/patients to prescribe/request the new drug.
The search engine Viral Sauce uses viral marketing research and statistical methods in order to rank the results of search queries by the perceived viral potential of content (using a measure which they call vRank), rather than by content's current popularity.
In doing so they claim to be able to retrieve content which is more interesting to niche users. 
In viral marketing, the aim is to spread awareness about a product offering, service or concept using word-of-mouth behaviors.
Unlike spam, which is based on a massive distribution of unsolicited emails, viral emails use social networking aspects to ensure their goals of wide propagation.
This is one of the strengths of viral email to marketers - while users are quick to delete email from marketers, they are less likely to delete the email if it comes from a person that they know.
As an example of viral marketing in practice, vouchers may be provided via email to customers, who are then encouraged to forward those emails on to friends and family.
In 2006, Threshers (a UK-based off-licence retail chain) emailed vouchers to staff and suppliers.
The emails were then redistributed by recipients, ultimately resulting in many of their branches almost running out of stock when the vouchers were honored by the company.
While at the time the Thresher Group denied that they were attempting to run a viral email-based marketing campaign, the company repeated the exercise the following year.
Similarly, a campaign for a Ferrari test drive garnered over 40,000 responses even though only 5,000 emails had been sent.
Nevertheless, as Ruth Rettie highlights, viral emails aren't always a boon to marketers - it is just as easy for negative, or even simply erroneous, emails to be spread.
Significantly, many viral emails that may appear to be advertisements are, in fact, fake, and run the risk of significantly damaging the brand. 
The genome is circular, composed of double stranded DNA and has six genes: large T, small t, viral protein 1 (VP1), viral protein 2 (VP2), and viral protein 3 (VP3) and agnoprotein.
It is about 5 kilobase pairs in length.
VP1-3 form the viral capsid. 
Viral pneumonia occurs in about 200 million people a year which includes about 100 million children and 100 million adults. 
A viral email (also known as a "pass-along email") is a certain kind of email which rapidly propagates from person to person, generally in a word-of-mouth manner.
This is an example of a viral phenomenon, which is used for profit in viral marketing, but can also contribute to the propagation of Internet memes like viral videos.