Swarms are not aggressive. in fact, when they find a resting place, swarms are usually very calm and are happy to find a new home.

A swarm is part of a colony of bees seeking a new home. Although the sight of swarm can bee overwhelming, they will usually find a branch and cluster into a large ball in a half hour or so. Swarming bees are not likely to sting you unless they get caught in your hair or crushed in your cloths. If you see a swarm, stand back and enjoy one of natures most spectacular displays.

DO NOT spray the cluster with water, RAID, or try to knock it off the branch. 

DO, call a local beekeeper who would be very happy to take this swarm away and to give it a new home. To learn more, go to the Swarm  Removal Page Swarms are usually very calm and are happy to find a new home.

Some people may have a systemic reaction to a bee sting. It is estimated that the prevalance of true bee sting allergies is 0.4 to 0.8 percent (that is 4 to 8 people out of every thousand people that  have the likelihood of an allergic reaction to a bee sting. For more information on a Bee Stings and Allergic Reactions, take some time to read this research.  

Compared Bee Sting allergy to other allergys

• Milk allergy is the most common childhood food allergy, affecting 2.5% of children less than age 3.  80% of milk allergy is outgrown by age 16.
• Food allergies affect approximately 6% of young children and 3 to 4% of adults in the US population.
• Six and a half million Americans (or 2.3% of the general population) are allergic to seafood.
• Life-threatening reactions to insect stings occur in 0.4% to 0.8% of children and 3% of adults. This is allergies to ALL insect stings combined.  Not just honeybees. 
  

"Allergy Statistics." American Academy of Allergy Asthma and Immunology. AAAA&I, n.d. Web. 16 Mar 2010. <http://www.aaaai.org/media/statistics/allergy-statistics.asp>.