Which of the following is NOT an indicator of a biological incident?

Excessive rainfall in a short time is considered not an indicator of a biological incident because it does not directly relate to biological threats or the spread of infectious agents. Biological incidents typically involve the intentional release or natural occurrence of pathogens that harm living organisms, such as people, animals, or plants.

Indicators of biological incidents generally include unusual health occurrences or behaviors suggesting an outbreak related to pathogens. Unusual numbers of sick animals, abandoned spray devices, and unscheduled unusual spraying can all serve as red flags for potential biological threats, whether they are the result of a deliberate bioterrorism act or a natural outbreak. These factors are more closely aligned with observable signs that could indicate a biological agent's presence or usage, helping in the timely identification and response to such incidents. Conversely, rainfall, while it may affect the environment in various ways, does not directly signal an incident involving biological agents.