Angela Merkel sat through a second official ceremony in a week on Tuesday as she welcomed Moldova's prime minister to Berlin.

The German Chancellor, who will celebrate her 65th birthday on Wednesday, sat on a white chair next to Maia Sandu outside the Chancellery as the national anthems of both countries were played.

It comes after Merkel was spotted uncontrollably shaking at three official events throughout June and July.

The incidents have raised fears for the health of Europe's longest-serving elected leader, who keeps a notoriously busy schedule.

Despite those fears, a new poll released Tuesday reveals that a third of Germans feel no sympathy for her.

Angela Merkel sat through another welcome ceremony in Berlin Tuesday alongside Moldova's Prime Minister, after three bouts of shaking at similar events raised fears for her health

Mrs Merkel, who turns 65 on Wednesday, took a seat alongside Maia Sandu as the national anthems of both their countries were played

Despite fears for Mrs Merkel's health, a poll has since revealed that a third of Germans have no sympathy for her

The figures were reported by Bild, after another survey for Augsburger Allgemeine found a third of Germans also want her to release a detailed update on her health.

Merkel initially blamed the shaking - which first occurred during a visit by Ukraine's president Volodymyr Zelenskiy on June 18 - on dehydration, with the weather in Berlin being hot that day.

But the second episode - on June 27 alongside German president Frank-Walter Steinmeier - happened in much more comfortable conditions.

A third episode then followed on July 10 as she stood alongside Finnish leader Antti Rinne during his visit to Berlin.

She was then pictured sitting down for the first time the following day, during a welcome ceremony for Denmark's prime minister Mette Frederiksen.

It marks the second time in a week that Merkel has sat through a welcome ceremony, after she took a seat when Danish Prime Minister Mette Frederiksen visited Berlin last week

Merkel has attempted to brush off the subsequent episodes of shaking as partly psychological, suggesting that they were triggered by the first.

She said that she is 'working through' the problem, adding: 'Just as it happened one day, so it will disappear.'

However the German chancellor insists she is doing 'very well' and there is no need to be alarmed about her wellbeing.

The German leader has no history of serious health problems, which has led many to speculate about what could be wrong.

There has also been speculation that she could be forced to step down from her position earlier than planned.

Mrs Merkel, who is Europe's longest-serving elected leader and keeps a notoriously busy schedule, has insisted that she is fine and has no health worries

Mrs Sandu was making her first visit to Berlin after winning an election on June 8, where she discussed pro-democracy reforms she is trying to push through

Merkel has announced that she will not run for reelection past the end of her current term, which finishes in 2021.

She has kept up a gruelling schedule since her first trembling spell a month ago including attending a G20 gathering in Japan followed by a crunch EU summit in Brussels.

She is also expected to embark on her annual summer holiday later this month.

A poll published at the weekend indicated that 59 per cent of Germans saw the shaking as Merkel's 'private' matter, while 34 per cent said it was a matter of public interest.

Merkel has been in power since 2005 and plans to step down at the end of her fourth term, in 2021.