Change: 97103 people who contracted the virus had died. Nearly all of the victims caught the disease through contact with infected birds. Although the virus has infected people, it has not yet made the necessary shift to allow it to transmit easily from person to person.Experts are   View changes from previous version. (Word count: 589)

Change: new form it could become.take.Antigenic drift is the normThere are three main types of influenza: A strain B strain C strain The strains are organized by the coatings, called antigens, that cover the virus. These antigens determine what type of living creature will contract the disease. Influenza   View changes from previous version. (Word count: 589)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 590)

Change: Driftdrift is the NormnormThere are three main types of influenza: A strain B strain C strain The strains are organized by the coatings, called antigens, that cover the virus. These antigens determine what type of living creature will contract the disease. Influenza B and   View changes from previous version. (Word count: 595)

Change:  a form of human influenza and mutate. For this reason, scientists around the globe are watching H5N1 very closely.See alsoBird flu outbreaksDiagnosis and treatmentPreventionVaccinations and antivirals   View changes from previous version. (Word count: 595)

Change: Renamed from Mutation and Antigenic Shift by mark Feb 19 2006, 2:53 PM EST for: change and to &

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 586)

Change: 1918, for example, killed 40 million people and caused major disruptions in all aspects of society. The Asian Flu pandemic of 1957 and the 1968 Hong Kong Flu pandemic were also sparked by antigenic shifts. Avian influenzaTo date, avian influenza has infected millions   View changes from previous version. (Word count: 586)

Change: a built up an immunity to the virus. Flu strains created through antigenic shift have caused devastating pandemics in the past. The Spanish Flu pandemic in 1918 killed 40 million people and caused major disruptions in all   View changes from previous version. (Word count: 579)

Change: not easily spread from person to person and it is rare and relatively hard to contract. Yet, health experts are worried that it could cause the next pandemic, or global flu outbreak. In the event of a pandemic, tens of millions   View changes from previous version. (Word count: 579)