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Acute viral hemorrhagic fever, known as Lassa, was first identified in 1969 in the town of Lassa, Borno State, Nigeria. Lassa is located in the valley of the Yeseram River near the southern end of Lake Chad. Three weeks after being infected with Lassa virus, patients feel sick. Pathogenesis is associated with immunosuppression, uncontrolled viral replication and host response, and infection does not cause lytic damage. Lassa viruses disable the host\\\'s immune system in several ways. The typical endosomal trafficking pathway essential for innate immune system recognition is bypassed. The most useful way for diagnosis is polymerase chain reaction (PCR) from blood. Sensitivity was reported as 79 % on the first day of hospitalization, increasing to 100 % on the third day. One of the most effective approaches to contain the spread of Lassa fever in endemic areas is to improve community cleanliness.

Full blood count is one of the critical laboratory tests. It provides information about the production of all blood cells, identifies the patient\\\\\\\\\\\\\\\'s ability to carry oxygen by evaluating red blood cell counts, and allows for immune system evaluation by assessing white blood cell counts with differential. This test helps diagnose anaemia, certain cancers, infections, and many others, as well as monitor the side effects of certain medications. For this reason, medical laboratories are flooded with a large number of blood and tissue samples that need to be analyzed as accurately as possible and in the shortest possible time. Moreover, it has different advantages, such as being cheap, simple to perform, and availability in different departments, from the emergency room to the critical care unit. Due to its usefulness in the assessment of health status of individuals, its parameters in cord blood, a major source of haemopoietic stem cell transplantation and an ideal source for laboratory investigations for newborns were determined to provide a useful guide to local neonatologists and stem cell transplant physicians. Therefore, it is critical to utilize this laboratory test to provide better care for patients.

Hypertension is a public health problem which has cut across all spheres of life and walks of life. From the literature review, the researcher has found that most hypertensive patients are less engaged in healthy behaviours because of knowledge deficit. The literature reviews also indicated that gender, age, level of education, lifestyle, and compliance to treatment regimen had significant association with healthy behaviours in patients with hypertension.