<br><br><div><span class="gmail_quote">On 3/28/07, <b class="gmail_sendername">Damien Broderick</b> <<a href="mailto:thespike@satx.rr.com">thespike@satx.rr.com</a>> wrote:<br><br></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Do marine and aerial critters suffer to the same extent as land<br>beasties from infection by microorganisms? I know nothing at all<br>about this, but it occurs to me that disease vectors might be far<br>more ubiquitous in oceans, since there'd be fewer "natural barriers"
<br>such as mountains and other land interruptions to easy migration. I<br>wonder if whales that spend their lives moving vast distances north<br>and south might have already developed early immunity to many<br>diseases that might clobber more territorial and hence immuno-naive
<br>animals. Or am I talking through my hat?</blockquote><div><br>There are two types of longevity: that which seems to be genetically programmed and that affected by accidents and infectious diseases. Average life span in humans in poorer countries is shorter than in wealthier countries due to a higher prevalence of and greater susceptibility to infectious disease, but maximum life span is not that different. The degenerative diseases of aging are not generally thought to be due to infectious agents.
<br><br>Stathis Papaioannou<br></div></div><br>