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February 18, 2018

Respiratory Syncytial Virus (RSV)

RSV Season Has Begun


In Idaho, Respiratory Syncytial Virus (RSV) season officially began the week ending January 6, 2018 and increased activity has been reported across the state.

Infants and children at risk for severe RSV infection can receive monthly doses of palivizumab (Synagis™) as prophylaxis during the RSV season. Voluntary RSV surveillance is conducted to inform healthcare providers about RSV trends in Idaho that may impact prescribing recommendations for palivizumab (Synagis™).

The beginning of the RSV season, or season onset, is adapted from the National Respiratory and Enteric Virus Surveillance System (NREVSS). RSV season onset occurs in the first of two consecutive weeks during which the reported total percentage of RSV specimens testing positive is ≥10%. Traditionally the RSV season in Idaho is December through April.

Numbers have begun to increase since week ending January 6, 2018; RSV activity usually occurs at a low level in the summer and early fall months and then begins to rise sharply in late fall. We will continue to gather surveillance data and provide weekly updates throughout the RSV season. 

We wish to thank all the participating laboratories for their contributions during this RSV season.


 2017-2018 Weekly RSV Season Data - Idaho  

Public Health District 1 2 3 & 4 5 6 7 IDAHO
Total Positive Tests* 
11 0 70 34 1 13 129
 Total Tests Submitted 127 0 237 80 10 87 541
 Percent Positive 8.66% 0.00% 29.54% 42.50% 10.00% 14.94% 23.84%
 *For week ending 2/10/2018            

Updated February 16, 2018