microscopic

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microscopic

(less commonly), microscopical
not large enough to be seen with the naked eye but visible under a microscope

microscopic

[¦mī·krə¦skäp·ik]
(optics)
(science and technology)
Of extremely small size.

microscopic

Observable only with the aid of a microscope.
References in periodicals archive ?
Assessment of the efficacy of an IgM- ELISA and microscopic agglutination test (MAT) in the diagnosis of acute leptospirosis.
Secondly, pertaining to the serological test that has been used, although the microscopic agglutination test (MAT) is the reference method for epidemiological serosurveys of leptospirosis, it has several drawbacks.
Microscopic Agglutination Test (MAT): was performed by standard procedure (13) using the following twelve serovars.
Laboratory-confirmed diagnosis of leptospirosis was defined as a 4-fold rise in titer between paired samples or a single titer of [greater than or equal to] 800 in the microscopic agglutination test (MAT) (11) or a positive result on the immunoglobulin M (IgM) ELISA (Bio-Manguinhos, Rio de Janeiro, Brazil) (13).