Search results
Results from the WOW.Com Content Network
In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state ...
The result of the test is read after 48–96 hours, ideally after 72 hours/3rd day. This procedure is termed the 'Mantoux technique'. A person who has been exposed to the bacteria would be expected to mount an immune response in the area of skin containing the bacterial proteins.
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
An induration (palpable raised hardened area of skin) of more than 5–15 mm (depending upon the person's risk factors) to 10 Mantoux units is considered a positive result, indicating TB infection. [citation needed] 5 mm or more is positive in HIV-positive person; Recent contacts of TB case
List of California area codes; List of Colorado area codes; List of Connecticut area codes; D. List of Delaware area codes; List of District of Columbia area codes; F.
List of California area codes; 0–9. Area codes 209 and 350; Area codes 213, 323, and 738; Area codes 310 and 424; Area codes 408 and 669; Area codes 415 and 628;
Golden Horseshoe region of Ontario, including suburban Toronto, Hamilton, Oshawa, and the Niagara Peninsula in Ontario: 321: 407: Central Florida: In addition to being the sole area code in the Space Coast region around the Kennedy Space Center, this is the only partial overlay area code in North America 323: 213
Area codes 613, 343, and 753 are telephone area codes in the North American Numbering Plan (NANP) for Ottawa and surrounding Eastern Ontario, Canada. Area code 613 is one of the 86 original North American area codes assigned in October 1947.