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Infectious diseases spread either by person to person contact, or indirectly by a vector or a fomite.

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How are noninfectious diseases caused?

Noninfectious diseases are caused by factors such as genetics, lifestyle choices (e.g. diet, exercise, smoking), environmental factors (e.g. pollution, radiation), and aging. These diseases develop over time and are not spread from person to person like infectious diseases. Examples of noninfectious diseases include heart disease, cancer, and diabetes.


What are the synthoism of germ theory?

The key points of the germ theory of disease are that microorganisms (germs) are responsible for causing infectious diseases, these microorganisms can be spread from person to person, and that proper hygiene and sanitation practices can prevent the spread of these diseases.


Who are responsible for spread of diseases?

Diseases can be spread by various factors including infected individuals, contaminated food or water sources, infected animals, and inadequate sanitation practices. In a broader sense, the responsibility for controlling the spread of diseases lies with healthcare systems, public health agencies, and individuals following prevention guidelines.


What diseases spread due to volcanoes?

Volcanic eruptions can cause health issues such as respiratory problems from exposure to ash and toxic gases like sulfur dioxide. Additionally, volcanic eruptions can lead to contaminated water sources, which can spread diseases like cholera and dysentery. The disruption of communities and healthcare systems post-eruption can also contribute to the spread of various infectious diseases.


Are all infectious diseases spread the same way?

No, infectious diseases can be spread through different modes of transmission such as respiratory droplets (e.g. flu), fecal-oral route (e.g. norovirus), sexual contact (e.g. HIV), and vector-borne transmission (e.g. malaria). The specific mode of transmission depends on the pathogen causing the disease.