Table 4 illustrates percent sensitivity, specificity and
accuracy of each component in detecting SCM irrespective
of etiological agent while Table 5 illustrates these factors
for gram positive infections alone. It was evident that the
values were highest for ALP followed by Zn for all types of
bacterial infections. For SCM caused by Gram positive
bacteria a high percent accuracy was also noticed for LDH
followed by Co and Fe (Table 5). In fact, there was increase
in sensitivity and positive predictive values for all the
parameters including ALP and Zn in Gram positive
bacterial infections. This might be due to the reduction in
the false negative cases, attributed to omission of E. coli
SCM where these components did not show an appreciable
increase (Table 2). Similar findings for ALP and LDH were
reported by Babaei et al. (2007), Katsoulos et al. (2010) and
Gera and Guha (2011b) for mastitis in cow, ewe and doe
milk. Percent sensitivity, specificity and accuracy for each
component were determined separately for SCM milk
containing gram positive bacterial infections alone, as
earlier reports state that Gram positive bacteria are the most
prevalent mastitogenic agent, especially Staphyloccocus spp.
(Hadmili et al., 2005; Guha et al., 2010), the same was
observed in the present investigation.