 Potential antiviral therapies include topical microbicide treatments that use RNAi to treat infection ( at Harvard Medical School ; in mice , so far ) by herpes simplex virus type 2 and the inhibition of viral gene expression in cancerous cells , knockdown of host receptors and coreceptors for HIV , the silencing of hepatitis A and hepatitis B genes , silencing of influenza gene expression , and inhibition of measles viral replication . Potential treatments for neurodegenerative diseases have also been proposed , with particular attention to polyglutamine diseases such as Huntington 's disease . 
