The people who initially came into contact with the letters showed no symptoms of exposure to the poison, but three officers who later examined the New York letter experienced minor symptoms that have since abated, police said.
Having access to this data is critical, particularly when patients present with conditions with which physicians may be unfamiliar, such as the symptoms of radiation exposure.
But members of the New York Police Department emergency service unit who came in contact with the letter that was opened at a city mail facility were examined for "minor symptoms" of ricin exposure that they experienced on Saturday, according to Paul Browne, NYPD spokesman.
To isolate the effect of the pesticide exposure on ADHD symptoms, the researchers controlled for a variety of health and demographic factors that could have skewed the results.
Symptoms typically develop within three to seven days of exposure and can include stiff neck, fever, headache, nausea, vomiting, increased sensitivity to light and an altered mental state, often confusion.
While most researchers agree that light exposure and melatonin can help reduce the symptoms of jet lag after arriving at your destination, not everyone thinks it makes sense to switch sleep schedules before a trip, which can cut into social time with family and friends.
Dr Golomb says that many studies have found that exposure to AChEis is linked to the kind of chronic symptoms that the sick veterans report.
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It said that exposure to the smoke from the pyres can exacerbate the symptoms of asthma, and that people less than half a kilometre from even small pyres may be exposed to high concentrations of irritants such as sulphur dioxide.
Because of its widespread use, inadequate protection by manufacturers, and long latency period (it takes about 12 to 20 years after exposure before symptoms appear), an almost un-quantifiable number of people have been harmfully exposed to asbestos.
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Warning signs of contact might not appear for hours after exposure, and extreme symptoms might not show up for days, so a victim might be unaware he or she has been exposed until it is too late for treatment.
If someone received a less severe exposure, such as through eating, the person would show early symptoms of weakness, confusion, headache, dizziness and shortness of breath.
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