Skip to Content


Proposed Data Collections Submitted for Public Comment and Recommendations

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble

In compliance with the requirement of Section 3506(c)(2)(A) of the Paperwork Reduction Act of 1995 for opportunity for public comment on proposed data collection projects, the Centers for Disease Control and Prevention (CDC) will publish periodic summaries of proposed projects. To request more information on the proposed projects or to obtain a copy of the data collection plans and instruments, call 404-639-5960 or send comments to Joan F. Karr, CDC Reports Clearance Officer, 1600 Clifton Road, MS-D74, Atlanta, GA 30333 or send an email to

Comments are invited on: (a) Whether the proposed collection of information is necessary for the proper performance of the functions of the agency, including whether the information shall have practical utility; (b) the accuracy of the agency's estimate of the burden of the proposed collection of information; (c) ways to enhance the quality, utility, and clarity of the information to be collected; and (d) ways to minimize the burden of the collection of information on respondents, including through the use of automated collection techniques or other forms of information technology. Written comments should be received within 60 days of this notice.

Proposed Project

Human Exposure to Cyanobacterial Toxins in Water (OMB No. 0920-0527)—Reinstatement—National Center for Environmental Health (NCEH), Centers for Disease Control and Prevention (CDC).

Background and Brief Description

Cyanobacteria (blue-green algae) can be found in terrestrial, fresh, brackish, or marine water environments. Some species of cyanobacteria produce toxins that may cause acute or chronic illnesses (including neurotoxicity, hepatotoxicity, and skin irritation) in humans and animals (including other mammals, fish, and birds). A number of human health effects, including gastroenteritis, respiratory effects, skin irritations, allergic responses, and liver damage, are associated with the ingestion of or contact with water containing cyanobacterial blooms. Although the balance of evidence, in conjunction with data from laboratory animal research, suggests that cyanobacterial toxins are responsible for a range of human health effects, there have been few epidemiologic studies of this association.

During August 2006, we conducted our first study to assess exposure to microcystins in recreational waters with a bloom of Microcystis aeruginosa. We recruited 104 people who gave informed consent to participate. Ninety seven people did their recreational activities on Lake 1, which had a confirmed M. aeruginosa bloom, and 7 others did their activities on Lake 2, which had no bloom. Study participants completed a pre-activity questionnaire, a post-activity questionnaire, provided a 10-ml blood sample, and completed a telephone symptom survey 7-10 days after exposure. The concentrations of microcystins in Lake 1 ranged from 2 to 5 ug/L and in Lake 2 were all below the limit of detection (LOD). When we designed the study, we calculated that a person exposed to recreationally-generated aerosols from water containing 10 ug/L of microcystins should have levels of microcystins in Start Printed Page 6571their blood. However, the microcystin concentrations in Lake 2 were below the LOD and in Lake 1 were actually 2ug/L to 5ug/L, much lower than we anticipated based on data from the previous week. Thus, the recreational exposures were not likely high enough for us to quantify microcystins in blood and the serum samples were all below the LOD for microcystins.

For the new data collection, we will recruit 100 study participants who are at risk for swallowing water or inhaling spray (i.e., water skiers, jet skiers, people sailing small boats) and who would normally be doing these activities, even in the presence of a bloom. We may recruit people who train for organized swimming events (e.g., triathlons) in lakes. In addition, we will recruit 50 study participants from lakes with no blooms as a comparison group to assess the health effects associated with recreational activities on “clean” lakes. Study participants will be asked to sign a consent form, complete a symptom survey before and after doing their recreational water activities, provide one 10-ml whole blood sample after their recreational activities, and complete a telephone symptom survey 8-10 days after doing study activities.

The purpose of the new data collection is to continue assessing the public health impact of exposure to the cyanobacterial toxins, microcystins, during recreational activities. We will examine the extent of human exposure to microcystins present in recreational waters and associated aerosols and whether serum levels of microcystins can be used as a biomarker of exposure.

There is no cost to the respondents other than their time.

Estimate of Annualized Burden Hours

FormsNumber of respondentsNumber of responses per respondentAverage burden per response (in hours)Total burden hours
Screening Questionnaire188110/6031
Pre-exposure Questionnaire150110/6025
Post-exposure Questionnaire150110/6025
10-day post exposure Questionnaire150110/6025
Start Signature

Dated: February 6, 2007.

Joan F. Karr,

Acting Reports Clearance Officer. Centers for Disease Control and Prevention.

End Signature End Preamble

[FR Doc. E7-2309 Filed 2-9-07; 8:45 am]