The researchers said their findings indicate previous exposure to the virus may not guarantee total immunity.

Researchers in the US have reported the country’s first confirmed case of coronavirus reinfection. A 25-year-old man with no known immune disorders o(...)

Taoiseach Micheál Martin outlines the new restrictions that have been imposed on the residents of Kildare, Laois and Offaly in response to a sharp increase in Covid-19 cases in the midlands. Photograph: Julien Behal

Residents of Kildare, Laois and Offaly face limits on their movement for at least two weeks as part of a series of new restrictions in these areas in (...)

Prof Dolores Cahill: “The views expressed by Prof Dolores Cahill are her own. They do not reflect the position of the school, college, institute or university,” says Prof Michael Keane. Photograph: Nick Bradshaw

The school of medicine in University College Dublin (UCD) has disassociated itself from views expressed by a professor who told an online alt-right in(...)

Preliminary data from a clinical trial suggested dexamethasone reduced the risk of dying in Covid-19 patients on ventilators by as much as 35 per cent and patients on oxygen by 20 per cent. Photograph: Yui Mok/PA Wire

Irish medical specialists treating severely ill Covid-19 patients are likely to immediately start administering the widely-available steroid drug show(...)

Prof Dolores Cahill claimed people who recover from Covid-19 are ‘immune for life’ after 10 days. Photograph: Nick Bradshaw/The Irish Times

A University College Dublin (UCD) professor, who chairs the Eurosceptic Irish Freedom Party, has been asked to resign from a leading European Union sc(...)

Adjustable ventilator system:  treats two patients with one machine. Photograph: NUI Galway

“Never let a good crisis go to waste” – the often-quoted words of former UK prime minister Winston Churchill when he worked to form the United Nations(...)

Mary Leahy of Heroes Aid demonstrates a fitting of a mask and visor at home on her son. Photograph: Joe O’Shaughnessy

Widespread shortages of personal protective equipment (PPE) for healthcare workers persist and are being exacerbated by continuing problems with globa(...)

Pfizer says it should be able to make millions of doses this year were it to succeed with one of its vaccine candidates

Pfizer has administered the first US patients with its experimental vaccines to fight coronavirus, part of a bid to shave years from the typical time (...)

Ireland is the worst country in the European Union for Shiga-toxigenic E.coli infection rates, suffering up to 10 times the European average. File photograph: Getty Images

A potentially lethal strain of E.coli has been found in Irish beaches, rivers and lakes which are popular with bathers and deemed to have excellent wa(...)

A young girl and her grandfather play at a park in Taipei on April 6th, 2020. Photograph: Sam Yeh/AFP

In the early days of the Covid-19 pandemic, researchers at John Hopkins University predicted that Taiwan would be one of the countries most affected b(...)

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