The 65-year-old, who is the first Indian to win the prestigious All England Championships title in 1980, is likely to be discharged later this week.
Sindhu won 16-21, 21-16, 21-19, in one hour and 16 minutes in the Super 1000 tournament.
The world number 30 pair of Ashwini and Sikki took just 33 minutes to see off the 13th ranked duo of Gabriela and Stefani 21-17 21-10 in the second-round match on Thursday night.
Lakshya Sen, who had claimed five titles in 2019, saw off France's Thomas Rouxel 21-18 21-16
The withdrawal of the Indonesian players will deplete the field, which has already been affected after Chinese, Koreans and Chinese Taipei shuttlers decided not to compete
World no 15 Praneeth saw off France's Toma Junior Popov 21-18 22-20, while HS Prannoy, a former top 10 player, brushed aside Malaysia's Daren Liew 21-10 21-10.
Playing Against Denmark’s Mia Blichfeldt, Nehwal was trailing 21-8, 10-4, when she was forced to quit the match due to an injury
The Indian women's duo of Ashwini Ponnappa and N Sikki Reddy and men's doubles pair of Satwiksairaj Rankireddy and Chirag Shetty also progressed to the second round
Srikanth lost to Ireland's unseeded player Nguyen Nhat, while Kashyap went down in straight games to top seeded Japanese Kento Momota
"No positive tests in the team anyone. We are ready for All England," India's Danish foreign coach Mathais Boe informed on Instagram.
The All England Championships was the final event on the BWF calendar to be played last year before all sporting activities came to a halt because of the pandemic.
A member of the support staff has also tested positive, leaving the players without much practice.
Olympic silver medallist Sindhu will again be one of the top contenders but Saina Nehwal is nowhere near her best with just two quarterfinal finishes to show in the last two years.
The tournament is scheduled to be played in Birmingham from March 17-21.
Sindhu said her decision to move to Gachibowli Indoor Stadium is more to do with her preparations for the Tokyo Olympics.
Former top 10 player HK Vittinghus of Denmark on Friday shared a Taiwanese media report that a 10-year-old sports student, who was at the All England Championship, was diagnosed positive for COVID-19
The season's first Super 1000 World Tour tournament is the last event before the Badminton World Federation's (BWF) suspension of all World Tour and sanctioned tournaments
PV Sindhu squandered a sparkling start as Nozomi Okuhara produced a rearguard action to outwit the Indian 12-21 21-15 21-13 in a 68-minute last-eight encounter of All England Badminton Championships
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