Diagnostic diagnostic image showing agarose gel electrophoresis of Polymerase Chain Reaction (PCR) products used for detecting Theileria annulata. The image consists of seven lanes. Lane M contains a 100 bp DNA ladder (marker) with multiple distinct bands of varying intensities used for fragment size estimation. Lane 1 displays a sharp, bright band at approximately 721 bp, serving as the positive control for T. annulata. Lane 2 shows a similar bright band at the same vertical migration level, indicating a positive clinical sample. Lanes 3, 4, and 5 contain negative clinical samples, showing no visible amplification bands. Lane 6 represents the negative control and is devoid of bands, confirming the absence of reagent contamination. This visual demonstrates molecular diagnostic techniques in infectious disease, specifically identifying the presence of parasitic DNA in biological samples through targeted primer amplification and size-based separation.

Educational figure illustrating the acetylation profiles of Theileria annulata-infected host cells treated with various histone deacetylase inhibitors (HDACi). Panel A presents a Western blot comparing protein expression across seven groups: Control, BPQ (1X, 5X), Belinostat (1X, 5X), and Vorinostat (1X, 5X). The Anti-acetyl Histone H4 bands (~13 kDa) show a dose-dependent increase in intensity following HDACi treatment, while the Histone H3 bands (~17 kDa) serve as a consistent loading control. Panel B is a bar graph quantifying the relative expression of acetylated H4, confirming the significant hyperacetylation induced by Vorinostat and Belinostat compared to control groups. Panel C displays immunofluorescence (IFA) microscopy of cells treated with Vorinostat, Belinostat, and Romidepsin. Three channels are shown: Anti-acetyl histone H4 (red), DAPI nuclear stain (blue), and a merged image. The IFA reveals enhanced red fluorescence in treated cells compared to the Control and BPQ groups, indicating concentrated histone acetylation within and around the parasite-infected host cell nucleus. This content demonstrates the molecular mechanism of HDAC inhibition in parasitology and cellular biology.

Peripheral blood smear from a patient with suspected chronic lymphocytic leukemia (CLL) shows a predominance of small, mature-appearing lymphocytes with scant cytoplasm and clumped nuclear chromatin, accompanied by fragile cells that readily disrupt during smear preparation, producing numerous smudge or basket cells visible on the slide. The image depicts a single smudge cell in the upper right, with numerous small darkly staining lymphocytes occupying the field. The smear was prepared with Wright-Giemsa stain and examined under light microscopy at high magnification (approximately 1000x total magnification with oil immersion). Clinically, CLL is defined by absolute mature lymphocytosis of ≥5.0 × 10^9/L sustained for ≥3 months, often asymptomatic and detected incidentally on complete blood count. Morphology alone is insufficient for diagnosis; immunophenotyping showing co-expression of CD5, CD19, CD23 with weak surface immunoglobulin and light chain restriction supports CLL diagnosis. Smudge cells result from fragile leukemic cells and reflect underlying cytoskeletal fragility, though they are not specific. The image illustrates typical features: monomorphic lymphocytes, scant cytoplasm, condensed chromatin, and absent prominent nucleoli. This finding has diagnostic significance, guiding further workup, including flow cytometry, cytogenetics, and molecular studies, to distinguish CLL from other chronic lymphoproliferative disorders such as small lymphocytic lymphoma (SLL), mantle cell lymphoma, prolymphocytic leukemia, and reactive lymphocytosis.

Peripheral blood smear prepared from a patient with suspected plasma cell leukemia (PCL) was examined by bright‑field light microscopy after Wright‑Giemsa staining. The smear shows several circulating plasma‑cell–like elements, including four conspicuous proplasmacytes with dispersed nuclear chromatin and prominent nucleoli, as indicated by arrows in the original figure. In addition, background erythrocytes exhibit rouleaux formation, a common feature in paraproteinemic states. The cells display eccentrically placed nuclei with pronounced basophilic cytoplasm and a coarse chromatin pattern; occasional cells show a perinuclear clearing (Golgi rim) suggestive of plasmacytic differentiation. Immunoglobulin light‑chain restriction is not determined on this smear alone but flow cytometry or immunohistochemistry would typically confirm clonal plasma cells. Relative proportions indicate that neoplastic plasma cells constitute a substantial fraction of leukocytes, consistent with plasma cell leukemia rather than reactive plasmacytosis. PCL is an aggressive myelomatous process often presenting with cytopenias, organomegaly, and sometimes lymphadenopathy; prognosis is poor, and treatment responsiveness is limited. This image illustrates characteristic morphologic features used for differential diagnosis against multiple myeloma, Waldenström macroglobulinemia, and other causes of plasmacytosis. Clinically relevant keywords include plasma cells, rouleaux, Wright‑Giemsa stain, 100X oil, peripheral blood, leukemia, myeloma, and hematologic malignancy.