Diagnosing the reasons for this long term decay are difficult because the Google search algorithms are proprietary, but it appears that in 2011 Google made changes that would suggest related search terms when people search for symptoms like “fever” and “cough” (it also seem that this feature is no longer active).
Kugundua sababu za uozo huu wa muda mrefu ni ngumu kwa sababu kanuni za utaftaji wa Google ni za wamiliki, lakini inaonekana kuwa mnamo 2011 Google ilifanya mabadiliko ambayo yangependekeza maneno ya utafutaji yanayohusiana wakati watu walitafuta dalili kama vile "homa" na "kikohozi" (inaonekana pia. kwamba kipengele hiki hakitumiki tena).