Summary. 1  Many human illnesses are caused by infection with either bacteria or viruses. 2  Most bacterial diseases can be treated with antibiotics, although antibiotic-resistant strains are starting to emerge. 3  Viruses pose a challenge to the bodyâs immune system because they hide inside cells.
As the 37th president of the United States, Nixon became deeply embroiled in scandal during his second term and was left with no option but to resign from office or be impeached. In addition to serving as president, he also served one term as representative, a partial term as senator, and two terms as vice president.
Andrew Johnson (in 1868) and Bill Clinton (in 1998) were the only two US presidents to be impeached. Neither one was convicted , so both finished their terms. Preliminary steps had begun in the House to impeach Richard Nixon when he resigned as President in 1974.