Hitos de la vacuna http://www.america.govpublications/ejournalusa/mar07/hitos-de-la-vacuna.html.rss Edward Jenner http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504171447cmretrop0.7412378.html http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504171447cmretrop0.7412378.html Tue, 05 May 2009 09:08:01 -0400 Louis Pasteur http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504173141cmretrop4.890078e-02.html http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504173141cmretrop4.890078e-02.html Tue, 05 May 2009 09:10:15 -0400 Salk, Sabin y la polio http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504173935CMretrop4.070461e-03.html http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504173935CMretrop4.070461e-03.html Tue, 05 May 2009 09:09:30 -0400 Erradicación de la viruela http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504174547cmretrop0.9173242.html http://www.america.govhttp://www.america.gov/st/health-spanish/2007/April/20090504174547cmretrop0.9173242.html Tue, 05 May 2009 09:08:41 -0400