Entry Category: Pathology

Ticks are a very specific cosmopolitan collection of obligate, haematophagous, ectoparasitic arthropods of vertebrates (mostly on reptiles, birds, and mammals). They are important as vectors of bacterial (mainly rickettsial and spirochaetal), protistal, and viral disease agents of domestic animals and humans, as well as other mammals. By 2016, sixteen tickborne diseases of humans were known, which includes four emerging diseases discovered since 2013. In 2017, state and local health departments around the country reported a record number (totaling 59,349) of cases of tickborne diseases to the Centers of Disease Control and Prevention (CDC) in Atlanta, Georgia, up from 48,610 in 2016. Tickborne diseases can range from producing mild symptoms that are treatable at home to causing symptoms including fever and …

Tuberculosis (also known as consumption) is a contagious, potentially fatal bacterial infection that mainly affects the lungs. It is caused by the tubercle bacillus (Mycobacterium tuberculosis), which was discovered by Robert Koch in 1882. By 1900, the disease was the second-leading cause of death in the United States, exceeded only by pneumonia. More than eighty percent of the U.S. population had been infected with the disease, although most people showed no symptoms. By the time a person showed symptoms, the disease was usually well advanced and had been spread to many others. The mortality rate for those with active infections was around eighty percent. In Arkansas, tuberculosis once affected one in sixty people and accounted for one out of every …

Typhoid is among the earliest diseases reported in Arkansas and was a significant public health problem up through the early twentieth century. Though it became less common in the modern era, typhoid had a significant impact upon state health in times and places where poor sanitation was the norm. Typhoid, like cholera, is transmitted through the ingestion of food or water that has been contaminated with the feces of an infected individual; the spread of the disease is therefore greatly linked with a lack of proper sanitation. Victims experience high fevers, sweating, inflammation of the gastrointestinal tract, and diarrhea. In most cases, the disease is not fatal, though fevers can last well over a month. Some individuals may become asymptomatic …

West Nile virus (WNV) is an arthropod-borne, positive-sense, single-stranded RNA flavivirus (family Flaviviridae, genus Flavivirus) that has emerged as a significant health risk for humans. WNV is one of several Japanese encephalitis antigenic serocomplex of viruses that also include Japanese encephalitis virus, Murray Valley encephalitis virus, St. Louis encephalitis virus, and some other flaviviruses. West Nile has also been associated with illness and death in a wide variety of North American reptiles, birds, and mammals. It was first recognized in Arkansas in 2002. WNV was first identified in 1937 in the West Nile District of the Republic of Uganda of eastern Africa. Prior to 1995, the last major human outbreak of WNV was in the 1950s in Israel. The ecology …

Well into the twentieth century, it was believed that all children had parasitic worms and that parents needed to treat this condition with patent or homemade medicines. These concoctions rid children of such intestinal parasites as roundworms (Ascariasis), threadworms (Trichuris), and tapeworms (Taenia solium), some of which also went by the colloquial names of pinworms and seatworms. Worm infestations, it was believed, could cause death. This is borne out by the census’s four mortality schedules (1850–1880). In these, “worms” and “worm fever” were listed as the causes of some children’s deaths, the majority occurring during the warm months of July through October. Some of these children may have died from the debilitating effects of worms or by being overdosed with …

In 1878 and 1879, Southern cities such as Memphis, Tennessee, and New Orleans, Louisiana, were devastated by epidemics of yellow fever. Citizens of Arkansas were also affected by the disease, leading to controversial quarantine measures that prohibited travel in parts of the state and also restricted the transportation of materials such as recently harvested cotton. The creation of the Arkansas State Board of Health resulted from successful efforts to protect Arkansans from the 1879 yellow fever epidemic. Yellow Fever (colloquially called “Yellow Jack”) is a potentially fatal virus that mosquitoes (Aedes aegypti) transmit to their human hosts through their bite. It attacks the body’s organs, mainly the liver, which causes jaundice, a yellowing of the patient’s skin and whites of …