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Which atmospheric layer contains ozone that contributes to the formation of smog?
Chronic Infections
Long-term infections that persist for months or years, often due to the inability of the immune system to clear the pathogen.
Latent Infections
Inactive infections in the body that have the potential to become active under certain conditions, often without showing immediate symptoms.
Direct Transmission
The immediate transfer of disease-causing agents between hosts through physical contact or proximity.
Indirect Transmission
The transfer of an infectious agent from a reservoir to a susceptible host via an intermediary object, vector, or animal.
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