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{{ANETextoAsociado48|titulo=PANDEMIC|contenido=Spread SSpread of a new disease at a certain speed, widely and simultaneously throughout several geographical areas of the world. The World Health Organisation (WHO) declared COVID-19 a pandemic after more than 100 countries officially registered cases of the disease.}}

{{ANETextoAsociado48|titulo=SPACIAL DIFFUSION|contenido=Spread, expansion or dissemination of a phenomenon over space and time. For the diffusion process to materialise, there must be a central source from which thephenomenon originates, a set of potential receptors, communication channels between the source and the receptors, and a variable period of time. The diffusion process passes through nodal points and may involve a spread that is either random, similar to that of an oil slick, or hierarchical. Spatial diffusion models came into widespread use following the work of Swedish geographer T. Haggerstränd in 1968.}}

{{ANETextoAsociado48|titulo=TRANSMISIÓN COMMUNITY TRANSMISSION|contenido=Community transmission is said to be present when a virus is detected in several people within a specific population or territory, and the origin of the infectionsare unknown. In the case of COVID-19, community transmission was detected when various people were tested positive for the disease after having recently visited China and other areas where the virus was spreading. This type of transmission denotes that the virus has been widespread in the community yet gone undetected for some time. When there is community transmission, the spread of the virus is deemed to be uncontrolled.}}

{{ANETextoAsociado48|titulo=POSITIVITY RATE|contenido=Percentage of COVID-19 tests that come back positive out of the total number amount of screening tests performed. A pandemic is deemed to be under control ifthis percentage lies under 5%. A positivity rate over 5%, on the other hand, suggests many people are unaware they are infected and therefore community transmission exists and screening is required. The general consensus is that this indicator offers a more accurate assessment of the risk of infection than the daily number of positives because as the number of screening tests performed may vary from day to day, whilst the positivity rate is a relative value that may always be used to compare different periods as long as the testing criteria remain the same.}}

{{ANETextoAsociado48|titulo=INCIDENCE|contenido=Number of detected cases of a disease in a given period and specific area or community. It could also be described as the probability that a person from a specific population will be affected by said disease. In addition, the incidence rate represents the speed at which new cases of the disease appear in the exposed population. It is calculated by dividing the number of new cases of the disease by the number of inhabitants. Lastly, the cumulative incidence is the proportion of people who fall ill in a given period of time. It is calculated by dividing the number of registered cases by the number amount of people who were free of the disease at the beginning of the period. It is usually calculated for every 100,000 inhabitants in periods of 7 to 14 days.}}