• A biological agent, such as an infectious microorganism, or a condition that constitutes a threat to humans, especially in biological research or experimentation.
  • The potential danger, risk, or harm from exposure to such an agent or condition.
  • A <xref>biological</xref> <xref>hazard</xref>; a source of risk due to some <xref>biological</xref> factor such as <xref>bacteria</xref> or human waste.
  • hazard to humans or the environment resulting from biological agents or conditions
  • any bacterium or virus or toxin that could be used in biological warfare
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