inclusion criteria: * age between 18 and 45 years old or 55 years and older * be eligible to receive one of the study vaccines as part of the trial * understand and agree to comply with study procedures (visits, telephone calls) * agree not to participate in any other vaccine study during the time of the study * give written informed consent prior to any examination performed as part of the trial

inclusion criteria: * age between 18 and 45 years old or 55 years and older * be eligible to receive one of the study vaccines as part of the trial * understand and agree to comply with study procedures (visits, telephone calls) * agree not to participate in any other vaccine study during the time of the study * give written informed consent prior to any examination performed as part of the trial

inclusion criteria: age between 18 and 45 years old or 55 years and older be eligible to receive one of the study vaccines as part of the trial understand and agree to comply with study procedures (visits, telephone calls) agree not to participate in any other vaccine study during the time of the study give written informed consent prior to any examination performed as part of the trial

inclusion criteria: age between 18 and 45 years old or 55 years and older be eligible to receive one of the study vaccines as part of the trial understand and agree to comply with study procedures (visits, telephone calls) agree not to participate in any other vaccine study during the time of the study give written informed consent prior to any examination performed as part of the trial

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