However, tick abundance within this area varies locally. This map shows the estimated distribution of Ixodes scapularis tick populations, commonly known as blacklegged or deer ticks. Stages most likely to bite humans are nymphs and adult females. However, adults may be out searching for a host any time winter temperatures are above freezing. miyamotoi ( hard tick relapsing fever), Ehrlichia muris eauclairensis ( ehrlichiosis), Babesia microti( babesiosis), and Powassan virus ( Powassan virus disease).Ĭomments: The greatest risk of being bitten exists in the spring, summer, and fall. mayonii (which cause Lyme disease), Anaplasma phagocytophilum ( anaplasmosis), B. Where found: Widely distributed across the eastern United States. Background data for this map is from the US National Atlas. This map has been designed to answer the question “What ticks should I be concerned about at a regional scale?” Please consult a local public health authority or USDA Agricultural Extension Office to determine more specific information at the state, county, or municipal level. This map is not meant to represent risks for a specific tick-borne disease, because disease transmission is influenced by multiple factors beyond mere tick presence. Adult females are most likely to bite humans. Transmits: Tularemia and Rocky Mountain spotted fever.Ĭomments: The highest risk of being bitten occurs during spring and summer. See county-level estimated and established distribution. More research is needed to understand the role of these species in disease transmission. similis is found west of the Rocky Mountains. Also occurs in limited areas on the Pacific. variabilis is widely distributed east of the Rocky Mountains.
Use this map to explore the estimated global population density (people per square kilometer) in 2020.Where found: D. This means urban areas could appear to have fewer people than they really do, while rural areas would seem to have more. All of these areas have a vastly different population density, but they are averaged together.
Whereas at a larger scale, such as the state, region, or province level, population density could vary widely as it includes a mix of urban, suburban, and rural places. Population density is most effective in small- scale places-cities or neighborhoods-where people are evenly distributed. While a useful tool for decision and policymakers, it is important to understand the limitations of population density. Infectious disease scientists use these maps to understand the spread of infectious disease, a topic that has become critical after the COVID-19 global pandemic. Experts can use this information to inform decisions around resource allocation, natural disaster relief, and new infrastructure projects. Understanding and mapping population density is important. Population density is the average number of people per unit, usually miles or kilometers, of land area. This has resulted in an increase in population density for these cities, which are now forced to expand in order to accommodate the growing population. Job opportunities in large cities have caused an influx of people to these already packed locations. In the last century, the global population has increased by billions of people.