However, the skin biopsy revealed leukocytoclastic vasculitis and negative staining for
Congo red and [kappa]-light chain, without IgA deposition.
Out of 50 CoNS isolates, 26 (52%) isolates were
Congo red positive.
On the basis of binding of
Congo red dye with EPS, different coloured phenotypes were observed: 7(14%) showed black and 43(86%) showed red, pink and white colours.
Congo red dye detects the presence of exo-polysaccharides produced by bacteria and turns black when interacts with slime components.
Biofilm formation by
Congo red agar (CRA) method:
Congo red agar medium was prepared with 37 g/l of brain heart infusion broth (BHI), 10 g/l agar, 50 g/l sucrose and 0.8 g/l
Congo red.
The results suggested that adsorption capability of Co-Ni ferrite could remove
Congo red dye from aqueous solution [1].
It is diagnosed by positive
Congo red immunostaining of bladder biopsies.
With an appropriate investigation and a skin biopsy stained with
Congo red, the diagnosis can be established.
These should be prepared with
Congo red stain to reveal the characteristic apple-green birefringence when viewed under polarized microscopy [2, 5].
The high magnification figures (x200) of
Congo red staining (c) and its green birefringence (d).
The results showed that these films could be good materials as photocatalysts and applicable for the photodegradation of dye pollutants, particularly
Congo red.
In addition, with positive CD3: immunohistochemical markers for reactive T lymphocytes, CD20: for reactive B lymphocytes, and CD38: for plasma cells and kappa and lambda positivity, similar areas of nodular formation were found with amyloid deposition using special staining for crystal violet (Figure 5) and
Congo red (Figure 6).