Cellular Brake Pad Inspection

ourselves. While the emergence of infections such as trated, and some of the few figures that are included smallpox has been linked to the development of the better explained. Even the novels of B.B. Jorden manage first numerically significant human communities, there to include a few drawings to illustrate, for example, the seems to be little indication that these or other virus life cycle of the fictitious Eke virus. infections have inhibited our desire to develop ever I also found some aspects of the text annoying. A few larger, more densely populated and inter-linked commu-basic errors should have been caught, and figures on nities. One only has to take a rush hour ride on a London the incidence of HIV infection are at odds with UNAIDS/ Underground train to be in viral heaven—in some re-WHO estimates. But perhaps more irksome is the view spects it's remarkable that some form of virulent agent prominent early in the book that virus evolution has been has not taken advantage of this tremendous potential driven by some malign influence. This clearly does not for transmission. fit with many situations in which viruses exist in well-Perhaps the fact that our communities and habits adapted harmony with a host—the devastating emer-provide such obvious opportunities for infectious agents gence of a virus often being due to some perturbation of can be ascribed to a general lack of appreciation for such an arrangement. As far as humankind is concerned, the nature of these organisms and how they operate. such perturbations are often a direct consequence of As Dorothy H. Crawford points out at the beginning of our own challenge to biological or territorial boundaries. this book, the popular press frequently confuse viral, As Crawford and others point out, the possible use of bacterial, and cellular pathogens using the moniker pig organs containing endogenous retroviruses for " bugs " and giving the impression that all infections can transplantation is a cause for concern. It is likely that be treated with a good dose of antibiotic. With a view novel human viral pathogens will continue to emerge. to providing some remedy for this situation, Crawford Whether these will derive from pigs or some other unex-has written a short text for nonbiologists that addresses pected source remains to be seen. what viruses are, how they differ from other infectious Nevertheless, someone wishing to gain a basic under-agents, why epidemics emerge, how …