March 13--News that a former Russian spy and his daughter were likely poisoned by a military-grade nerve agent in the British city of Salisbury has spread fears over possible secondary contamination and piqued curiosity about a toxic substance that is as mysterious as it is potentially lethal.

Former Russian military intelligence officer, Sergei Skripal, 66, and his 33-year-old daughter, Yulia, are hospitalized in critical condition after what British authorities said was an attempted murder using a substance from a group of nerve agents known as Novichok, which in Russian means "novice" or "newcomer."

So what exactly is Novichok?

The former Soviet Union invented Novichok agents and "pioneered their manufacturing techniques," said Dan Kaszeta, an expert in chemical, biological, radiological and nuclear defense with Strongpoint Security, a defense and security consultancy in London.

In a series of "key takeaways" posted on Twitter on Monday , Kaszeta said the agents were "specifically developed to evade the West/NATO's detection capabilities" and foil efforts to collect intelligence. Experts believe that Novichok, considered to be among the deadliest chemical agents, was manufactured specifically to kill people.

The Soviets, and subsequently Russian authorities, "went to great lengths to keep the program secret at a point when the USSR had already agreed in principle to chemical arms control," Kaszeta tweeted.

The 1997 Chemical Weapons Convention, to which Russia was a signatory, aimed to eliminate the production, acquisition and stockpiling of chemical weapons, according to the Organization for the Prohibition of Chemical Weapons.

Are nerve agents easy to make?

It's "difficult, but not impossible," Victor Madeira, a senior fellow at the Institute for Statecraft headquartered in the United Kingdom, told the website Business Insider.

"Nerve agents are rare, tightly controlled synthetic substances that do require specialized knowledge to manufacture, store and use safely," the website quoted Madeira as saying.

Andrea Sella, a chemistry professor at University College London, told the Guardian newspaper that the level of toxicity of nerve agents "is such that they are only to be manufactured in specialized facilities."

They are "not materials that can be made at home," she said.

How can nerve agents, such as Novichok, enter the body?

They are easily dispersed and can be absorbed through the skin, ingested and inhaled, according to the Organization for the Prohibition of Chemical Weapons.

Kaszeta said at least one Novichok agent "is a solid at normal temperatures" and "could be deployed as a dust or powder," allowing for slower absorption. And powder would be "harder to detect with normal chemical warfare detection means."

It is unclear how and when the Skripals were exposed to the poison. They were reported to have visited a local restaurant and pub before being found slumped unconscious on a park bench.

What are the symptoms and impact of exposure to nerve agents?

"Nerve agents are the most toxic of the known chemical warfare agents," according to the Agency for Toxic Substances and Disease Registry, a federal public health agency of the U.S. Department of Health and Human Services.

The Organization for the Prohibition of Chemical Weapons reported that a low dose of nerve agent could cause "minor poisoning," with symptoms such as "increased production of saliva, a running nose and a feeling of pressure on the chest." Additional warning signs include impaired night vision, headaches, fatigue, slurred speech, hallucinations and nausea.

Exposure to a higher dose of nerve agent causes more dramatic and pronounced symptoms, the agency reported. These include difficulty in breathing leading to coughing; discomfort in the gastrointestinal tract causing cramps and vomiting; involuntary discharge of urine and defecation; running eyes; sweating; muscular weakness; and tremors or convulsions. Victims can lose consciousness and die.

"Consequently, death caused by nerve agents is a kind of death by suffocation," the organization reported.

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