"It's possible even if the train is not crowded, " he told New Scientist magazine.
His work has been published on the pre-print website arxiv.org and is reported in New Scientist magazine.
Dr Vitetta told New Scientist magazine that the vaccine also had no side-effects.
Further studies published in New Scientist magazine back up this theory.
The research was originally reported in the New Scientist magazine.
The FBI's Strategic Information and Operations Center (SOIC) posted its "Social Media Application" market research request onto the web on 19 January, and it was subsequently flagged up by New Scientist magazine.
New Zealand husband and wife research team Rex and Christine Munday claimed in New Scientist magazine last year that eating half a clove of raw garlic a day could help protect against cancer.
Last year, researchers from the San Francisco Medical Examiner's Department said in New Scientist magazine that it was regular doses of antimony potassium tartrate, or tartar emetic a poisonous colourless salt which was used to make him vomit, that killed him.
This latest theory, originally published in the journal BioEssays and reported in New Scientist magazine, says the key to hiccuping lies in a group of animals for whom combining closure of the glottis and contraction of the "breathing in" muscles does serve a clear purpose.
New Scientist magazine reports that the researchers, led by Mark Tuszynski, of the University of California, San Diego, believe a substance called nerve growth factor (NGF) can prevent the death of cells in the brain known as cholinergenic neurons, and stimulate new connections between the cells.
Research published in New Scientist magazine last year by Leysia Palen, assistant professor of computer science at the University of Colorado, revealed that social networking sites, including Twitter, were more effective than government emergency services when it came to distributing information during emergencies such as the Virginia Tech shooting of April 2007.
However, New Scientist, a British magazine, said experts had told it that the outbreak probably began a few months earlier in China.
Take, for instance, the online site for the British magazine, New Scientist.
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