Moderna has dosed the first participant in the Phase I/II study of its Covid-19 vaccine candidate, (mRNA-1273 or TAK-919), in Japan, led by Takeda Pharmaceutical.

TAK-919 is Takeda’s development code for Moderna’s vaccine candidate for Covid-19.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

Moderna CEO Stéphane Bancel said: “We are pleased that this Phase I/II study of our Covid-19 vaccine in healthy adults in Japan has begun.

“This is the first clinical trial of a Moderna product in Japan and we thank Takeda for partnering with us to potentially protect the Japanese population from Covid-19 with a vaccine.”

The multi-centre, placebo-controlled Phase I/II study will analyse the safety and immunogenicity of two intramuscular (IM) doses of mRNA-1273 in healthy Japanese male and female adults, administered 28 days apart.

Takeda plans to enrol 200 subjects aged 20 years and above in the country. Each subject will be randomly assigned to receive either placebo or a 100μg dose each of the vaccine at both inoculations.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

They will be followed up for a year after the second vaccination.

The trial’s primary outcomes include the percentage of subjects with reported solicited local adverse events (AEs) for seven days after each dose and percentage of subjects with Covid-19 until day 57 among others.

Last October, the Ministry of Health, Labour and Welfare of Japan (MHLW) agreed to purchase and distribute 50 million doses of Moderna’s mRNA-1273 starting in the first half of this year, subject to regulatory approvals.

Moderna will produce and supply the vaccine while Takeda, with the support of the MHLW, the Japan Agency for Medical Research and Development (AMED), and Moderna, which is in charge of all import, local regulatory, development and distribution activities in Japan.

Last month, Moderna initiated dosing in a Phase II/III study of its Covid-19 vaccine candidate, mRNA-1273, in healthy adolescent participants aged between 12 and 17.

Clinical Trials Arena Excellence Awards - Nominations Closed

Nominations are now closed for the Clinical Trials Arena Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
Recognised with 2025 Excellence Awards for Research and Development and Marketing , Novotech converted FDA/EMA fast track designations into faster HDV trial timelines while translating complex HBV science into sponsor ready insights. Discover how this dual strength in execution and communication is reshaping liver disease clinical development.

Discover the Impact