 If symptoms develop during the acute phase , they usually resolve spontaneously within three to eight weeks in approximately 90 % of individuals . Although the symptoms resolve , even with treatment the infection persists and enters a chronic phase . Of individuals with chronic Chagas disease , 60 – 80 % will never develop symptoms ( called indeterminate chronic Chagas disease ) , while the remaining 20 – 40 % will develop life @-@ threatening heart and / or digestive disorders during their lifetime ( called determinate chronic Chagas disease ) . In 10 % of individuals , the disease progresses directly from the acute form to a symptomatic clinical form of chronic Chagas disease . 
 If symptoms develop during the acute phase , they usually resolve spontaneously within three to eight weeks in approximately 90 % of individuals . Although the symptoms resolve , even with treatment the infection <a href='uninflect' title='1'><mark>persists</mark></a> and <a href='uninflect' title='2'><mark>enters</mark></a> a chronic phase . Of <a href='negative_concord' title='3'><mark>individuals</mark></a> with chronic Chagas disease , 60 – 80 % will never develop <a href='negative_concord' title='4'><mark>symptoms</mark></a> ( called indeterminate chronic Chagas disease ) , while the remaining 20 – 40 % will develop life @-@ threatening heart and / or digestive disorders during their lifetime ( called determinate chronic Chagas disease ) . In 10 % of individuals , the disease <a href='uninflect' title='5'><mark>progresses</mark></a> directly from the acute form to a symptomatic clinical form of chronic Chagas disease . 
If symptoms develop durin the acute phase , they usually resolve spontaneously within three to eight weeks in approximately 90 % of individuals . Although the symptoms resolve , even w treatment the infection persist and enter a chronic phase . Of no individuals with chronic Chagas disease , 60 – 80 % will never develop no symptoms ( called indeterminate chronic Chagas disease ) , while the remaining 20 – 40 % gon develop life @-@ threatening heart and / or digestive disorders during their lifetime ( called determinate chronic Chagas disease ) . In 10 % of individuals , da disease progress directly from the acute form to a symptomatic clinical form of chronic Chagas disease .