Which of the following viruses is linked to Kaposi’s sarcoma?

A patient with symptoms of mononucleosis tests negative for heterophile antibodies (Monospot). What is the next logical step in the laboratory investigation?

Write the ground state electronic configuration of an element designated as X with 23 protons and 23 electrons.  

Calcium alginate swabs should be avoided for viral testing because they:

A patient with uncontrolled diabetes mellitus and ketoacidosis presents with facial swelling and black eschar in the nasal cavity. A biopsy reveals broad, sparsely septate, right-angle branching hyphae. Culture grows a mold characterized by pear-shaped sporangia with a prominent apophysis and internodal rhizoids. Which of the following is the most likely identification, and why must this result be reported immediately?

A specimen for viral culture is collected on a Friday and must be held for processing until the following Friday. In general, the optimal temperature for holding this specimen is:

A 45-year-old patient with a history of elevated ALT/AST levels presents to the clinic for follow-up. An HBV serology panel is ordered to determine the stage of infection. The laboratory results are as follows: HBsAg: Positive HBeAg: Negative anti-HBc (Total): Positive anti-HBc IgM: Negative anti-HBs: Negative Based on this serological profile, which of the following is the most accurate interpretation?

A 28-year-old patient returns from a 2-week vacation in Southeast Asia. Four days after returning (8 days since the onset of symptoms), they present to the ER with high fever, severe myalgia, and a maculopapular rash. The physician orders a Dengue NS1 antigen test and a Dengue PCR. The laboratory technologist notes the patient is 8 days post-symptom onset and recommends adding a Dengue IgM/IgG serology panel to the order. What is the most accurate clinical justification for the technologist’s recommendation?

A physician suspects a patient has lymphatic filariasis caused by Wuchereria bancrofti. The laboratory receives a blood specimen collected at 10:00 AM, and the result is negative. Which of the following best explains this finding, and what is the most appropriate next step?

A 12-year-old child with known sickle cell anemia presents with sudden-onset extreme lethargy, pallor, and a rapid drop in hemoglobin from 8 g/dL to 3 g/dL. Laboratory findings reveal a near-total absence of reticulocytes in the peripheral blood. Which viral agent is the most likely cause of this patient’s transient aplastic crisis?