Please see the attached paper, just published in BMJ.
The article has some outstanding fever identification charts as well:
https://www.bmj.com/content/bmj/suppl/2018/11/29/bmj.k4766.DC1/anub038321.wi.pdf
https://www.bmj.com/content/bmj/suppl/2018/11/29/bmj.k4766.DC1/anub038321.w1.pdf
Best
Madhu