Zero Dose Protocol: What It Is and Who Should Get It
According too the Ministry of Health, as of january 19, 2026, cases of measles in Mexico have increased to 7,168 infections, as well as 24 deaths associated with this viral disease.
The first cases were identified in February 2025 in the state of chihuahua, where some of the infections were related to incomplete or non-existent vaccination schemes.
Measles in Mexico. Photo: Special
given the measles outbreak that continues to be active in the country and the arrival of millions of visitors to Mexico City for the World Cup, the capital authorities announced the strengthening of vaccination against this virus, with emphasis on points of high mobility such as the Mexico City International Airport (AICM) and the bus terminals.
Read also: Measles outbreak in Mexico: Who should get vaccinated against the virus?; this is what is known
The zero dose of the measles vaccine is a
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Boeing 737 MAX: Status as of January 23, 2026
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The boeing 737 MAX has been largely recertified and returned to service globally following two fatal crashes in 2018 and 2019, but continues to face scrutiny regarding production quality and safety oversight as of January 23, 2026. Recent events include ongoing FAA audits and investigations into manufacturing defects, as well as increased pressure from regulators and airlines.
The FAA’s Oversight of the 737 MAX
the Federal Aviation Administration (FAA) maintains ongoing oversight of the Boeing 737 MAX, focusing on design changes, pilot training, and manufacturing processes. The FAA’s primary goal is to ensure the aircraft meets all safety standards before allowing further expansion of operations.
Detail: Following the crashes of Lion Air Flight 610 on October 29, 2018, and Ethiopian Airlines Flight 302 on March 10, 2019, the 737 MAX was grounded worldwide. The crashes were linked to a faulty Maneuvering Characteristics Augmentation System (MCAS). The FAA initiated a thorough review of the aircraft’s design and certification process.Recertification required software updates to MCAS, revised pilot training, and enhanced maintenance procedures.
Example or Evidence: On December 29, 2020, the FAA issued an Airworthiness Directive lifting the grounding order, contingent upon Boeing completing the required software updates and training.FAA Airworthiness directive 2020-24-AD details the specific requirements for returning the 737 MAX to service.
Recent Manufacturing Issues and Investigations (2024-2026)
Boeing has faced renewed scrutiny since January 2024 due to a mid-air door plug blowout on Alaska Airlines Flight 1282, prompting investigations by the FAA and the National Transportation Safety Board (NTSB). These investigations have revealed quality control lapses in Boeing’s manufacturing processes.
Detail: The Alaska Airlines incident led to the temporary grounding of 737 MAX 9 aircraft for inspections.The NTSB’s preliminary report indicated that bolts securing the door plug were missing.The FAA subsequently initiated a broader audit of Boeing’s production facilities and quality control systems.Further issues,including improperly drilled holes and missing documentation,were discovered during the audit.
Example or Evidence: on february 29, 2024, the FAA announced it was increasing its oversight of Boeing, including limiting Boeing’s production rate and requiring a comprehensive action plan to address the identified quality control issues. FAA Statement on Boeing Quality Control outlines the agency’s concerns and required actions.
NTSB Examination of Alaska Airlines Flight 1282
The National Transportation Safety Board (NTSB) is conducting a thorough investigation into the Alaska Airlines Flight 1282 incident to determine the root cause of the door plug failure.
Detail: The NTSB’s investigation focuses on the manufacturing process, quality control procedures, and maintenance records related to the door plug. Investigators are examining whether the incident was the result of a single failure or a systemic issue within Boeing’s production system.
Example or Evidence: The NTSB’s preliminary report, released on February 6, 2024, confirmed that the door plug was not properly secured with the required bolts. NTSB Preliminary Report – Alaska Airlines flight 1282 provides detailed findings from the initial investigation.
Boeing Leadership Changes
Boeing has undergone significant leadership changes in response to the ongoing safety concerns and manufacturing issues. These changes aim to restore confidence in the company’s commitment to safety and quality.
Detail: In march 2024,