<prompt> Translate the following text to EnglishUtafiti wa hivi karibuni unaonyesha kuwa athari za siku moja zinaweza kupungua kwa hatari ya kuambukizwa kwa muda mfupi Schwartz, 2000; Zanobetti et al, 2002.  <response>: More recently, several studies have found that the practice of examining the effects on a single day basis may significantly understate the risk of short-term exposures Schwartz, 2000; Zanobetti et al, 2002. 