Biological warfare agents can be in the form of powder or drops, but it might also be the case that a substance without any visibility or scent is spread through the water, food supply or the air. In Denmark there has never been an attack or intentional release with biological warfare agents, but there are regularly alarms where the Police contact CBB in relation to suspicious materials.
When such incidents occur, CBB carries out a threat analysis and, if necessary, deploys a Field Investigation Team to take samples and investigate the situation further.
Most biological warfare agents do not transmit from person to person, and no biological warfare agents are infectious in the incubation period, i.e. before there are disease symptoms. Thus, it is sufficient to take a thorough bath and change clothes before persons are able to leave an area where there has been a possible biological incident. The emergency services will provide assistance in this context.
The Police and health inspectors will provide information regarding samples and whether treatment is necessary.
If you do get symptoms after exposure of, for example, a letter containing powder, the most likely reason is that it is a simple infectious disease, as for example a cold, chicken pox, or a common flu and not related to the letter. However to be on the safe side please call the health inspectors.