It is not anthrax they fear, but its antidote. In recent weeks, some congressional aides have complained that mail on Capitol Hill, all of which is being irradiated to kill anthrax and other deadly agents, is making them ill. They say the mail is causing skin irritation, headaches and nausea, as well as tingling, bleeding and the taste of metal in their mouths.
The symptoms, staffers say, can last up to 24 hours, beginning after they touch irradiated letters and subsiding as long as they avoid contact with mail.
More than 150 congressional staffers have reported feeling sick since authorities ordered the irradiation of government mail to try to prevent a recurrence of last fall's deadly anthrax outbreak.
About 80 postal workers, most of whom process mail at a suburban Maryland facility, have also reported feeling ill after handling mail irradiated for their protection.
"It's unnerving," said Luke Albee, Leahy's chief of staff, who helps sort mail in the wake of the anthrax scare, during which a letter filled with anthrax spores was found addressed to Leahy but was never opened.
Albee said he and other staffers in the office began noticing the symptoms last month, once postal service resumed on Capitol Hill.
"Clearly," he said, "something's going on with the mail."
Initially, some blamed the fumigation of the Hart Senate Office Building, which was pumped full of anthrax-killing chlorine dioxide gas after an aide to Senate Majority Leader Tom Daschle opened an anthrax-tainted letter there. Building managers recirculated air through the offices, and authorities said the complaints declined.
The Postal Service has declared the mail perfectly safe. Testing by the Environmental Protection Agency has found no excessive levels of any chemicals in any Capitol Hill building since mail delivery resumed.
Federal authorities suggest that the reported sicknesses might be related, in part, to the initial high dose of radiation that melted the plastic in some mail, such as in the address windows of business letters. It's possible, authorities said, that staffers felt sick not from the irradiation process but from the fumes of molten plastic.
The Postal Service said it thinks it has remedied the problem by reducing the radiation exposure for all mail, removing plastic from the irradiation procedure and airing out letters before delivery. Mail treated this way should begin landing on desks as early as this week, congressional aides say.
Investigators have suggested that some of the symptoms might be due to unrelated winter colds and flu. As for the skin irritations, officials speculate that because mail becomes brittle after irradiation, it can absorb moisture from the hands of those who touch it and cause some soreness. The more serious complaints, officials say, in all likelihood have nothing to do with the mail.
"We're not aware of any clinical evidence that associates the irradiated mail with the symptoms that have been reported," said Gerry Kreinkamp, a Postal Service spokesman. "If [mail handlers] feel like they've had an adverse reaction to dry mail, use moisturizer."
Some Hill aides said they remain angered by what they called a blase reaction by investigators.
"It's kind of an odd situation where we're being reassured there's nothing wrong with the mail, but they're also assuring us we're not all psycho cases," Albee said of briefings by investigators. "It's fair to say there are a number of offices who believe they could be acting more aggressively."
Last week, the Office of Compliance, which enforces labor laws on Capitol Hill, began an independent investigation at the behest of Hill staffers. Sen. Charles E. Grassley, an Iowa Republican, also requested a inquiry. A board consisting of several health agencies, under the leadership of the Senate's sergeant-at-arms office, is already looking into the matter.
At least two lawmakers have reported health problems. Sen. Dianne Feinstein, a California Democrat, complained this month after she and some staffers found themselves coughing and sneezing and thought it could be related to the mail. And Rep. Billy Tauzin, a Louisiana Republican, reported headaches and a temporary feeling of malaise after handling mail.
"There are a lot of employees who have complaints of illness, and they feel that they haven't been addressed," said Gary Green, general counsel for the Office of Compliance. "We're going to look into this as thoroughly as we can, until we find an answer."
Now, mail workers are reporting similar body aches, skin irritation and other symptoms at the Suburban Processing and Distribution Facility in Gaithersburg. Workers there have handled the bulk of the government mail routed from the still-shuttered Brentwood facility.
"This facility is handling significant volumes of irradiated mail," said Corey Thompson, a safety and health specialist for the American Postal Workers Union who wants investigators to continue the search for a definitive cause.
"We probably haven't looked at what the actual cause of the problem is yet," Thompson said. "The folks doing the evaluations have been looking at things they suspected in their first round of studies, but they haven't actually hit on whatever is causing the problem."
Some lobbyists representing the mail industry contend that Congress overreacted in demanding irradiation of all government mail. The government has no plans to stop irradiating the mail in the foreseeable future.
"Congress should back off," said Gene Del Polito, president of the Association for Postal Commerce, which represents direct-mail companies.
"They should back off this policy of irradiating every piece of mail that heads up to Capitol Hill, in the absence of a clear and present danger. If anything like it happened again, it probably wouldn't be anthrax. So it's like pouring water on a fire that's already gone out."
The ideas include: an indicator strip in mailboxes that would turn color if a letter contained a biological agent; a wearable detection device that would signal if the mail handler became contaminated; and a mail-sorting machine that would halt at the detection of a deadly substance.
For now, mail call on Capitol Hill will remain fraught with anxiety.
Letters addressed in a child-like scrawl with no return address will be discarded as potential threats, and correspondence will remain slowed by days.
Irradiated mail will arrive damaged at times- a paper clip can set a whole batch of mail on fire when the electron beam hits it - and crisply baked.
"It is," Albee said, "the brave new world."