Prevention and Control of Infectious Diseases Act 1988 (Act 342)

When the Movement Control Order (MCO) brought nearly all of Malaysia to a halt in March 2020, the legal power behind it did not come from any new emergency law — but from a public health act that had existed since 1988.

That act is the Prevention and Control of Infectious Diseases Act 1988, better known as Act 342. This article describes the contents of the act in descriptive terms: what it provides, who enforces it, and why it has become a matter of public discussion. It is not legal advice.

What is Act 342 and why does it exist?

Act 342 is a federal law intended “to amend and consolidate the law relating to the prevention and control of infectious diseases”. It replaced a collection of old, pre-Independence quarantine and disease-prevention enactments. According to the Second Schedule of the act, the written laws repealed include the Federated Malay States Quarantine Enactment and Prevention of Disease Enactment, the Vaccination Enactment, the Quarantine and Prevention of Disease Ordinance 1939, several state enactments (among them Johor, Kedah, Kelantan, Perlis and Terengganu), and the Malaria Eradication Act 1971 (Act 52).

According to the official text published by the Attorney General’s Chambers, the act received royal assent on 13 August 1988, was gazetted on 8 September 1988, and came into force throughout Malaysia on 1 April 1989 (P.U. (B) 179/1989).

Administration of the act rests with the Minister of Health, the Director General of Health, and “authorised officers” — that is, any Medical Officer of Health, health inspector, or officer appointed by the Minister under Section 3. Police, customs and immigration officers are required to render assistance when requested (Section 5).

What diseases does this act cover?

Act 342 applies only to “infectious diseases”, that is, diseases listed in the First Schedule. In the updated text published by the Attorney General’s Chambers (as at 1 July 2020), Part I of the schedule lists diseases numbered 1 to 30 (with COVID-19 added as an additional item, 3A), while Part II lists Human Immunodeficiency Virus (HIV) infection.

Among the listed diseases:

Examples in Part I	Part II
Cholera (item 3)	HIV infection (all forms)
Dengue and dengue haemorrhagic fever (item 4)
Tuberculosis, all forms (item 22)
Rabies (item 18), malaria (item 13), leprosy (item 11)
COVID-19 (item 3A in the AGC English text)
“Any other life-threatening microbial infection” (item 30)

This list is not fixed. Section 30 gives the Minister the power to delete, add to or amend the First Schedule by order in the Gazette. COVID-19 was added through an amendment to the First Schedule in 2020 (P.U. (A) 179/2020).

What are the main powers under this act?

Part IV of the act — “Control Against the Spread of Infectious Disease” — contains the day-to-day powers most frequently used. Below is a summary of some of the core sections:

• Section 10 — duty to notify. Every adult occupant of a house where an infectious disease appears, and every medical practitioner treating such a case, must notify the health authority as soon as possible.
• Section 11 — declaration of a local infected area. If the Minister is satisfied there is an outbreak or threat of an epidemic in an area, he may declare it a local infected area and make regulations controlling movement within or from that area.
• Section 14 — isolation of infected and suspected persons, with removal to a quarantine station.
• Section 15 — observation or surveillance of contacts.
• Section 18 — disinfection and closure of premises.
• Section 31 — power to make regulations to carry the act into effect, including controlling the entry and movement of persons and quarantine procedures.

Under Section 11(3), while a local infected area order is in force, an authorised officer may direct any person or category of persons to undergo treatment, immunisation, isolation, observation or surveillance. Section 11(4) and Section 15(2) further provide that an officer may use “such force as may be necessary” to secure compliance — a provision that has become one of the most discussed issues.

How did Act 342 become the basis for the COVID-19 MCO?

The March 2020 MCO was built on the two-tier mechanism in Section 11. First, the Minister declared local infected areas through the Prevention and Control of Infectious Diseases (Declaration of Local Infected Areas) Order 2020 [P.U. (A) 87/2020]. According to RLSE’s legal analysis, all states and Federal Territories were declared local infected areas so that restrictions could apply at the national level, because the powers under the relevant subsection apply only “within or from” a declared area.

Second, the actual movement restriction measures were set out through the Prevention and Control of Infectious Diseases (Measures Within Local Infected Areas (No. 2)) Regulations 2020, gazetted on 31 March 2020 under subsection 11(2) of the act. It is this structure — a declaration order followed by measures regulations — that recurred throughout the various phases of the MCO, CMCO and RMCO.

What are the penalties under this act?

Part V of the act sets out offences and penalties. Section 22 defines general offences — including obstructing an authorised officer, disobeying a lawful order, or giving false information. According to the original text of the act:

• Section 24 (general penalty) — for offences without a specific penalty: a first offence, imprisonment of up to two years or a fine or both; a second or subsequent offence, imprisonment of up to five years; and for a continuing offence, an additional fine not exceeding RM200 per day.
• Section 25 (compounding) — the Director General or an authorised officer may compound certain offences by collecting a sum of money not exceeding RM1,000.

It is these rates that became among the targets of amendments in the following years.

Why has this act become a matter of debate?

After the pandemic, the government brought a bill to strengthen Act 342. According to CodeBlue’s report, the Dewan Rakyat passed the Act 342 Amendment Bill on 14 October 2024 by voice vote.

Among the changes reported in the bill:

• Section 24 (general penalty) raised to a maximum fine of RM10,000 for individuals and RM100,000 for bodies corporate.
• Section 25 (compound) raised to a maximum of RM5,000 for individuals and RM50,000 for bodies corporate.
• Section 31(3) provides for a fine of up to RM8,000, imprisonment of up to two years, or both, for an individual who breaches the regulations, and up to RM50,000 for a body corporate.
• A new Section 21A gives the Director General of Health the power to issue any direction to any person or class of persons to take disease prevention and control measures.

Views on the amendments varied. Supporters argued that they strengthen the Ministry of Health’s ability to tackle infectious diseases and align the law with international developments. Opponents — including some members of parliament from both sides, legal bodies and rights groups — voiced concern that heavier penalties could disproportionately affect low-income groups, that safeguards against abuse of the Director General’s powers were insufficient, and that the approach relied too heavily on punishment rather than health education. This article takes no position; it merely records that both views exist in the public debate.

What comes next

Act 342 remains the core legal framework of Malaysia’s public health response to infectious diseases, and its sequence — declaration, regulations, directions, penalties — is likely to be reused in any future health crisis. The penalty figures and specific powers are the subject of amendments passed by the Dewan Rakyat in 2024, so the latest operative rates depend on the instruments that have been gazetted and their dates of coming into force.

For an authoritative reference, the full text and any latest amendments can be checked on the Attorney General’s Chambers’ official portal (lom.agc.gov.my). This article is a general explanation and not legal advice; for specific situations, consult a legal practitioner or the health authorities.