THURSDAY, April 18 (HealthDay News) -- A Mississippi man has
been arrested in connection with the sending of letters suspected
of being tainted with the deadly toxin ricin to President Obama and
a Republican senator, federal agents said Wednesday night.
The FBI has identified the suspect as Paul Kevin Curtis of
Corinth, Miss., according to the
New York Times.
On Wednesday, officials reported that a preliminary,
inconclusive test suggests the deadly toxin ricin was in a letter
sent to President Obama on Tuesday, officials report.
The letter was intercepted at the White House mail screening
facility, which is not located near the White House complex,
USA Todayreported Wednesday.
The preliminary test showed evidence of ricin, but the FBI said
only a complete second test can confirm if the letter actually did
contain the deadly poison, the
Ricin, which is found in the castor oil plant, can prove deadly
if inhaled, one expert noted.
"Without a doubt, ricin is toxic," said Victoria Richards, a toxicologist and assistant professor of medical sciences at the Frank H. Netter MD School of Medicine at Quinnipiac University in Connecticut.
"If castor beans are eaten [about 20 for an adult] death can occur in six to eight days," Richards said. "When concentrated, ricin powder may be lethal in a much shorter timeframe. There is a process called oral inhalation, in which powders or aerosolized agents [depending on the particle size] can be deposited in the mouth and eventually swallowed."
If swallowed, "ricin will cause nausea, vomiting, bloody
diarrhea and dehydration," Richards added. "Multiple organ damage
also occurs, and eventually death."
At least three U.S. senators also reported receiving suspicious
mail in recent days. A letter sent to Sen. Roger Wicker, R-Miss.,
tested positive for ricin in a preliminary test. On Wednesday
morning, a suspicious letter was received by Sen. Richard Shelby,
R-Ala., and a suspicious package was received by Sen. Carl Levin,
"We do not know yet if the mail presented a threat," Levin said, USA Todayreported.
The letter received by Wicker on Tuesday contained a "white
granular substance" and was quarantined before the initial test
indicated that the substance was ricin. The letter was intercepted
at an off-site mail facility. The material has been sent to an
accredited laboratory for further analysis.
The president was briefed on the suspicious letters on Tuesday
night and again on Wednesday morning, said White House Press
Secretary Jay Carney,
For more on ricin, head to the
U.S. Centers for Disease Control and