0123-9392 0123-9392 S0123-93922017000400251 10.22354/in.v21i4.688 Ecuador Ecuador Ecuador Colombia Ecuador 00 12 2017 00 12 2017 21 4 251 254

2014 70 7 7 2133-43 2013 4 1-17 2016 54 3 3 529-34 Clinical and Laboratory Standards Institute 2016 2009 47 6 6 1631-9 2015 10 3 3 1-13 2016 71 1 1 274-6 2011 70 1 1 119-23 2009 9 4 4 228-36 2012 25 4 4 682-707 2013 68 3 3 487-9 Centers for Diasease Control and Prevention. CDC 2015 ;( No 24 2012 18 9 9 1503-7 2010 65 7 7 1319-21 2015 4 5 5 772-83 2009 65 2 2 249-51 1983 209 1 1 229-33 2012 18 5 5 263-72 2013 20 4 4 340-4 2014 58 12 12 7553-6