Peter Handscomb fell ill in stifling heat as Australia reached 2-225 at stumps, trailing Bangladesh by 80 runs, on day two of the second Test in Chittagong.
Handscomb received medical treatment but played through Tuesday’s last session to finish on 69 not out as the visitors took control of the match after dismissing Bangladesh for 305.
David Warner was unbeaten on 88, delivering another big subcontinent score after making a century in the first Test in Dhaka.
Nathan Lyon earlier took his tally for the innings to seven wickets to continue his excellent series.
Play was paused for about five minutes late in the final session when Handscomb pulled up on his haunches, looking clearly unwell after running between the wickets.
The 26-year-old sat on the ground and was examined by team doctor Geoff Verrall, who applied cold towels to his head and neck.
The Australians have struggled with the conditions throughout the match, with sole quick Pat Cummins receiving treatment on Monday for a heat-related illness.
Handscomb, who showed sublime footwork during his stylish knock, faced 113 deliveries in the difficult conditions, while Warner dealt with 170.
After scoring an aggressive ton in Dhaka, Warner changed gears with a patient and composed knock to bring up his 25th Test half-century from 98 balls.
The left-hander was dropped on 52, with Mominul Haque putting down a difficult chance at short-leg off the bowling of Taijul Islam.
He also benefited from a bungled stumping on 73, with Bangladesh skipper Mushfiqur Rahim fumbling the ball when Warner danced down the pitch and missed an attempted slog.
Mushfiqur, who top-scored for Bangladesh with 68, had earlier taken a spectacular diving catch off the bowling of paceman Mustafizur Rahman to dismiss Matt Renshaw (4).
It was an excellent afternoon session for the Australians, who had looked somewhat vulnerable when skipper Steve Smith threw his wicket away shortly before tea.
The Australian skipper was on 58 when he was clean-bowled by a straight delivery from left-arm spinner Taijul shortly before tea.
Smith fumed as he walked from the ground after leaving an inviting gap between bat and pad for Taijul to exploit in his first ball of the innings.
He had looked in imperious touch, reaching his half-century from 81 balls and twice dispatching dangerous left-arm spinner Shakib Al Hasan for four with audacious standing sweep shots.
Lyon earlier finished with 7-94 – his fourth seven-wicket haul and the equal-second best figures of his career after claiming 8-50 against India earlier this year in Bangalore.
amreeka
Guest
vodoo in progress here ..... dont worry
Lancey5times
Roar Rookie
It's amazing isnt it. And see the comment below from Ross. He is just too easy to bait. He understands so little it's remarkable
Basil
Guest
...as well as his personal chef.
jameswm
Roar Guru
Some people love a conspiracy theory...
Ross
Guest
Lance hohns is the selector on duty for this tour
Chui
Guest
No, but a few of Ranatunga's runners probably got fatigue
AREH
Roar Guru
But...the Gabba is generally good to bat on, and you can all but guarantee he will be picked there.
Ross
Guest
The reason khawaja was taken out by Trevor Hohns was because this pitch is good to bat on and they didn't want him showing the selectors up again
Chris Love
Roar Guru
The kid obviously has learned a thing or two being shown faith for the full test series in India. Tough kid with great skills agains spin. Good to see him put it together. I hope he goes on to make a big ton tomorrow, it will give him a hell of a lot of confidence going forward. Pity such short sightedness from selectors meant that Usman wasn't shown the same treatment.
Tigerbill44
Roar Guru
20 to 30 years ago Cricket was just a winter sports in Bangladesh. Now they play it all year around. pretty tough conditions there for everyone.
BrainsTrust
Guest
They need to avoid quick running between the wickets , backing up, pressuring the fieldsmen by running the first hard etc. Take a leaf out of Ranatunga did he ever get heat stroke. It was fitness fanatic Dean Jones that did.
Carltonian
Guest
Drink plenty of beer in the dressing sheds at the end of the day's play and he'll be like new.
Damo
Guest
Yep. Just dehydration(unless they've said otherwise). He'll basically be on a drip all night ready to go tomorrow.
Jameswm
Guest
I'm backing he'll be there at start of play tomorrow.