Definition Of Pandemic
The classical epidemiological definition of a pandemic assumes that 1 pandemic occurs in temperate southern and northern hemispheres, as seasonal epidemics cross international borders and affect a large number of people. In 2009, Doshi argues that the definition of an influenza pandemic is elusive and does not refer to the classical definition.  Pandemics can be defined as epidemics that occur over a wide area, cross international borders and affect a very large number and include the population immunity, virology and severity of disease. A true flu pandemic occurs when there is a simultaneous transmission.
Pandemic, demos, local people, crowds) is an epidemic of an infectious disease that spreads rapidly over a large region (for example, across several continents) and affects a significant number of people. A widespread or endemic disease with a stable number of infected people is not a pandemic. A pandemic affects a significant part of the world’s population for several months.
A widespread endemic disease with a stable number of infected people, such as seasonal influenza recurrence, is excluded because it occurs in a large region of the world and spreads rapidly.
Throughout history, pandemics such as cholera, plague and influenza have played an important role in shaping human civilization. The deadliest pandemic recorded in history was the Black Death, also known as the plague. In the 14th century, an estimated 75 to 200 million people died. Throughout human history, there have been a number of pandemics of diseases, such as smallpox.
A pandemic is an outbreak of an infectious disease that occurs over a wide geographic area, has a high prevalence and affects a significant percentage of the world’s population over several months. A pandemic occurs when an epidemic or outbreak is limited to one part of the world, such as to a single country. However, a pandemic or epidemic occurring on a scale that transcends international borders can affect people all over the world.
A pandemic is an outbreak of an infectious disease that occurs in a wide geographical area with high prevalence. During an epidemic, on the other hand, many more cases occur than would be expected in certain regions where it would not normally spread. A central fact in pandemics is the global spread of a new disease such as the new influenza virus or coronavirus (COVID-19).
An epidemic, on the other hand, occurs when far more cases than expected occur in a developed community or region but do not spread further. Viral respiratory diseases such as those caused by new influenza or coronavirus (COVID-19) are more likely to develop into pandemics. Knowing how to isolate yourself and exercise physical distance can help stop the spread of a pandemic.
Very few people are immune to flu pandemics, even if they had seasonal flu or seasonal flu vaccines. By definition, a pandemic ends when a virus is no longer spread throughout the world or in several countries or regions.
Although there is no uniform definition of the term, it is fruitful to look at diseases known as pandemics and to try to understand them by examining the similarities and differences between them. The diseases we are considering reflect the spectrum of aetiology, spread mechanisms and onset times, including acute hemorrhagic conjunctivitis (AHC), AIDS, cholera, dengue, influenza, plague, severe acute respiratory syndrome (SARS), scabies, West Nile disease and obesity. Most uses of the word pandemic relate to diseases that cover a large geographical area, such as plague, cholera, influenza and human immunodeficiency virus.
The term “endemic outbreak,” “epidemic” or “pandemic” indicates a common disease at a time when compared to its earlier time. It is based on how many cases of a disease are compared to the expected number of cases at a given time and how quickly they spread. The term is also used to describe infections and diseases such as hypertension, cancer, violence and positive well-being, which are described in the same way.
The two differ when it comes to the number of people and the geographical areas that affect them. The Centers for Disease Control and Prevention (CDC) defines a pandemic as an outbreak that spreads across several countries or continents and affects many people. The classification of pandemics is based on diseases affecting the world’s population.
An epidemic refers to a sudden increase in the number of cases of a disease expected in the population of a region. Epidemics can occur anywhere in the world, but you may not know how large the epidemic is or how it will affect your community.
Cluster refers to the aggregation of cases in a group or place at a time when the number is suspected to be greater than expected, but the actual expected number is not known. An outbreak has the same definition as an epidemic but is used for a limited geographical area.
The role of epidemiology is to determine the prevalence of a disease (the proportion of the population affected) and the frequency (occurrence) of a disease over a period of time, and to guide an appropriate public health response. Pandemic is an epidemic that spreads across several countries or continents and affects a large number of people. By contrast, plague is not an epidemiological term, but refers to a highly contagious bacterial disease characterized by fever and delirium, such as the bubonic plague.
The sudden emergence and rapid global spread of the novel H1N1 influenza virus in early 2009  caused confusion about the meaning of the term “pandemic” and whether a pandemic should be detected when it occurs. Not all terms for infectious diseases are the same, and not all are used interchangeably. Some terms suggest certain thresholds above which an event is declared an outbreak, an epidemic, or a pandemic, but these distinctions are often blurred by epidemiologists.